fix: build amd64 and arm64 images in parallel via matrix

Each platform now gets its own runner with QEMU, running concurrently.
The single-job QEMU approach built architectures sequentially.
Restores the digest+merge pattern to combine parallel builds into a
single multi-arch manifest.

.github/workflows/build-disk-collector.yml

@@ -16,11 +16,13 @@ on:
         default: false
 
 jobs:
-  check_authorization:
-    name: Check authorization to publish new Docker image
+  setup:
+    name: Resolve version and check authorization
     runs-on: ubuntu-latest
     outputs:
       isAuthorized: ${{ steps.check-auth.outputs.is_authorized }}
+      version: ${{ steps.vars.outputs.version }}
+      tag_latest: ${{ steps.vars.outputs.tag_latest }}
     steps:
       - name: check-auth
         id: check-auth
@@ -30,19 +32,7 @@ jobs:
           else
             echo "is_authorized=${{ contains(secrets.DEPLOYMENT_AUTHORIZED_USERS, github.triggering_actor) }}" >> $GITHUB_OUTPUT
           fi
-
-  build:
-    name: Build and push multi-arch disk-collector image
-    needs: check_authorization
-    if: needs.check_authorization.outputs.isAuthorized == 'true'
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      packages: write
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-      - name: Resolve version and tags
+      - name: Resolve version and tag_latest
         id: vars
         run: |
           if [ "${{ github.event_name }}" = "release" ]; then
@@ -53,18 +43,24 @@ jobs:
             VERSION="${{ inputs.version }}"
             TAG_LATEST=${{ inputs.tag_latest }}
           fi
-
-          TAGS="ghcr.io/${{ github.repository_owner }}/project-nomad-disk-collector:${VERSION}
-          ghcr.io/${{ github.repository_owner }}/project-nomad-disk-collector:v${VERSION}"
-          if [ "$TAG_LATEST" = "true" ]; then
-            TAGS="$TAGS
-          ghcr.io/${{ github.repository_owner }}/project-nomad-disk-collector:latest"
-          fi
-
           echo "version=$VERSION" >> $GITHUB_OUTPUT
-          echo "tags<<EOF" >> $GITHUB_OUTPUT
-          echo "$TAGS" >> $GITHUB_OUTPUT
-          echo "EOF" >> $GITHUB_OUTPUT
+          echo "tag_latest=$TAG_LATEST" >> $GITHUB_OUTPUT
+
+  build:
+    name: Build disk-collector image (${{ matrix.platform }})
+    needs: setup
+    if: needs.setup.outputs.isAuthorized == 'true'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    strategy:
+      fail-fast: false
+      matrix:
+        platform: [linux/amd64, linux/arm64]
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
       - name: Set up Docker Buildx
@@ -75,13 +71,59 @@ jobs:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-      - name: Build and push
+      - name: Build and push by digest
+        id: build
         uses: docker/build-push-action@v6
         with:
           context: install/sidecar-disk-collector
-          platforms: linux/amd64,linux/arm64
-          push: true
-          tags: ${{ steps.vars.outputs.tags }}
+          platforms: ${{ matrix.platform }}
+          outputs: type=image,name=ghcr.io/${{ github.repository_owner }}/project-nomad-disk-collector,push-by-digest=true,name-canonical=true,push=true
+      - name: Export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"
+      - name: Upload digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ matrix.platform == 'linux/amd64' && 'amd64' || 'arm64' }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  merge:
+    name: Create and push multi-arch manifest
+    needs: [setup, build]
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: /tmp/digests
+          pattern: digests-*
+          merge-multiple: true
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Create manifest list and push
+        run: |
+          VERSION="${{ needs.setup.outputs.version }}"
+          TAGS="-t ghcr.io/${{ github.repository_owner }}/project-nomad-disk-collector:${VERSION}"
+          TAGS="$TAGS -t ghcr.io/${{ github.repository_owner }}/project-nomad-disk-collector:v${VERSION}"
+          if [ "${{ needs.setup.outputs.tag_latest }}" = "true" ]; then
+            TAGS="$TAGS -t ghcr.io/${{ github.repository_owner }}/project-nomad-disk-collector:latest"
+          fi
+          docker buildx imagetools create $TAGS \
+            $(printf 'ghcr.io/${{ github.repository_owner }}/project-nomad-disk-collector@sha256:%s ' *)
+        working-directory: /tmp/digests
       - name: Inspect image
         run: |
-          docker buildx imagetools inspect ghcr.io/${{ github.repository_owner }}/project-nomad-disk-collector:${{ steps.vars.outputs.version }}
+          docker buildx imagetools inspect ghcr.io/${{ github.repository_owner }}/project-nomad-disk-collector:${{ needs.setup.outputs.version }}

.github/workflows/build-primary-image.yml

@@ -16,11 +16,13 @@ on:
         default: false
 
 jobs:
-  check_authorization:
-    name: Check authorization to publish new Docker image
+  setup:
+    name: Resolve version and check authorization
     runs-on: ubuntu-latest
     outputs:
       isAuthorized: ${{ steps.check-auth.outputs.is_authorized }}
+      version: ${{ steps.vars.outputs.version }}
+      tag_latest: ${{ steps.vars.outputs.tag_latest }}
     steps:
       - name: check-auth
         id: check-auth
@@ -30,19 +32,7 @@ jobs:
           else
             echo "is_authorized=${{ contains(secrets.DEPLOYMENT_AUTHORIZED_USERS, github.triggering_actor) }}" >> $GITHUB_OUTPUT
           fi
-
-  build:
-    name: Build and push multi-arch primary image
-    needs: check_authorization
-    if: needs.check_authorization.outputs.isAuthorized == 'true'
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      packages: write
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-      - name: Resolve version and tags
+      - name: Resolve version and tag_latest
         id: vars
         run: |
           if [ "${{ github.event_name }}" = "release" ]; then
@@ -53,18 +43,24 @@ jobs:
             VERSION="${{ inputs.version }}"
             TAG_LATEST=${{ inputs.tag_latest }}
           fi
-
-          TAGS="ghcr.io/${{ github.repository_owner }}/project-nomad:${VERSION}
-          ghcr.io/${{ github.repository_owner }}/project-nomad:v${VERSION}"
-          if [ "$TAG_LATEST" = "true" ]; then
-            TAGS="$TAGS
-          ghcr.io/${{ github.repository_owner }}/project-nomad:latest"
-          fi
-
           echo "version=$VERSION" >> $GITHUB_OUTPUT
-          echo "tags<<EOF" >> $GITHUB_OUTPUT
-          echo "$TAGS" >> $GITHUB_OUTPUT
-          echo "EOF" >> $GITHUB_OUTPUT
+          echo "tag_latest=$TAG_LATEST" >> $GITHUB_OUTPUT
+
+  build:
+    name: Build primary image (${{ matrix.platform }})
+    needs: setup
+    if: needs.setup.outputs.isAuthorized == 'true'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    strategy:
+      fail-fast: false
+      matrix:
+        platform: [linux/amd64, linux/arm64]
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
       - name: Set up Docker Buildx
@@ -75,16 +71,62 @@ jobs:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-      - name: Build and push
+      - name: Build and push by digest
+        id: build
         uses: docker/build-push-action@v6
         with:
-          platforms: linux/amd64,linux/arm64
-          push: true
-          tags: ${{ steps.vars.outputs.tags }}
+          platforms: ${{ matrix.platform }}
+          outputs: type=image,name=ghcr.io/${{ github.repository_owner }}/project-nomad,push-by-digest=true,name-canonical=true,push=true
           build-args: |
-            VERSION=${{ steps.vars.outputs.version }}
+            VERSION=${{ needs.setup.outputs.version }}
             BUILD_DATE=${{ github.event.release.created_at }}
             VCS_REF=${{ github.sha }}
+      - name: Export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"
+      - name: Upload digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ matrix.platform == 'linux/amd64' && 'amd64' || 'arm64' }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  merge:
+    name: Create and push multi-arch manifest
+    needs: [setup, build]
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: /tmp/digests
+          pattern: digests-*
+          merge-multiple: true
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Create manifest list and push
+        run: |
+          VERSION="${{ needs.setup.outputs.version }}"
+          TAGS="-t ghcr.io/${{ github.repository_owner }}/project-nomad:${VERSION}"
+          TAGS="$TAGS -t ghcr.io/${{ github.repository_owner }}/project-nomad:v${VERSION}"
+          if [ "${{ needs.setup.outputs.tag_latest }}" = "true" ]; then
+            TAGS="$TAGS -t ghcr.io/${{ github.repository_owner }}/project-nomad:latest"
+          fi
+          docker buildx imagetools create $TAGS \
+            $(printf 'ghcr.io/${{ github.repository_owner }}/project-nomad@sha256:%s ' *)
+        working-directory: /tmp/digests
       - name: Inspect image
         run: |
-          docker buildx imagetools inspect ghcr.io/${{ github.repository_owner }}/project-nomad:${{ steps.vars.outputs.version }}
+          docker buildx imagetools inspect ghcr.io/${{ github.repository_owner }}/project-nomad:${{ needs.setup.outputs.version }}

.github/workflows/build-sidecar-updater.yml

@@ -16,11 +16,13 @@ on:
         default: false
 
 jobs:
-  check_authorization:
-    name: Check authorization to publish new Docker image
+  setup:
+    name: Resolve version and check authorization
     runs-on: ubuntu-latest
     outputs:
       isAuthorized: ${{ steps.check-auth.outputs.is_authorized }}
+      version: ${{ steps.vars.outputs.version }}
+      tag_latest: ${{ steps.vars.outputs.tag_latest }}
     steps:
       - name: check-auth
         id: check-auth
@@ -30,19 +32,7 @@ jobs:
           else
             echo "is_authorized=${{ contains(secrets.DEPLOYMENT_AUTHORIZED_USERS, github.triggering_actor) }}" >> $GITHUB_OUTPUT
           fi
-
-  build:
-    name: Build and push multi-arch sidecar-updater image
-    needs: check_authorization
-    if: needs.check_authorization.outputs.isAuthorized == 'true'
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      packages: write
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-      - name: Resolve version and tags
+      - name: Resolve version and tag_latest
         id: vars
         run: |
           if [ "${{ github.event_name }}" = "release" ]; then
@@ -53,18 +43,24 @@ jobs:
             VERSION="${{ inputs.version }}"
             TAG_LATEST=${{ inputs.tag_latest }}
           fi
-
-          TAGS="ghcr.io/${{ github.repository_owner }}/project-nomad-sidecar-updater:${VERSION}
-          ghcr.io/${{ github.repository_owner }}/project-nomad-sidecar-updater:v${VERSION}"
-          if [ "$TAG_LATEST" = "true" ]; then
-            TAGS="$TAGS
-          ghcr.io/${{ github.repository_owner }}/project-nomad-sidecar-updater:latest"
-          fi
-
           echo "version=$VERSION" >> $GITHUB_OUTPUT
-          echo "tags<<EOF" >> $GITHUB_OUTPUT
-          echo "$TAGS" >> $GITHUB_OUTPUT
-          echo "EOF" >> $GITHUB_OUTPUT
+          echo "tag_latest=$TAG_LATEST" >> $GITHUB_OUTPUT
+
+  build:
+    name: Build sidecar-updater image (${{ matrix.platform }})
+    needs: setup
+    if: needs.setup.outputs.isAuthorized == 'true'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    strategy:
+      fail-fast: false
+      matrix:
+        platform: [linux/amd64, linux/arm64]
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
       - name: Set up Docker Buildx
@@ -75,13 +71,59 @@ jobs:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-      - name: Build and push
+      - name: Build and push by digest
+        id: build
         uses: docker/build-push-action@v6
         with:
           context: install/sidecar-updater
-          platforms: linux/amd64,linux/arm64
-          push: true
-          tags: ${{ steps.vars.outputs.tags }}
+          platforms: ${{ matrix.platform }}
+          outputs: type=image,name=ghcr.io/${{ github.repository_owner }}/project-nomad-sidecar-updater,push-by-digest=true,name-canonical=true,push=true
+      - name: Export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"
+      - name: Upload digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ matrix.platform == 'linux/amd64' && 'amd64' || 'arm64' }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  merge:
+    name: Create and push multi-arch manifest
+    needs: [setup, build]
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: /tmp/digests
+          pattern: digests-*
+          merge-multiple: true
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Create manifest list and push
+        run: |
+          VERSION="${{ needs.setup.outputs.version }}"
+          TAGS="-t ghcr.io/${{ github.repository_owner }}/project-nomad-sidecar-updater:${VERSION}"
+          TAGS="$TAGS -t ghcr.io/${{ github.repository_owner }}/project-nomad-sidecar-updater:v${VERSION}"
+          if [ "${{ needs.setup.outputs.tag_latest }}" = "true" ]; then
+            TAGS="$TAGS -t ghcr.io/${{ github.repository_owner }}/project-nomad-sidecar-updater:latest"
+          fi
+          docker buildx imagetools create $TAGS \
+            $(printf 'ghcr.io/${{ github.repository_owner }}/project-nomad-sidecar-updater@sha256:%s ' *)
+        working-directory: /tmp/digests
       - name: Inspect image
         run: |
-          docker buildx imagetools inspect ghcr.io/${{ github.repository_owner }}/project-nomad-sidecar-updater:${{ steps.vars.outputs.version }}
+          docker buildx imagetools inspect ghcr.io/${{ github.repository_owner }}/project-nomad-sidecar-updater:${{ needs.setup.outputs.version }}