ci: Optimize Docker image build process (#23149)

.dockerignore

@@ -1,21 +1,27 @@
-# We want to include the THIRD_PARTY_LICENSES.md file in the Docker image,
-# but not other .md files
-**/*.md
-!**/THIRD_PARTY_LICENSES.md
-**/.env
-.cache
-assets
-node_modules
-packages/node-dev
-packages/**/node_modules
-packages/**/dist
-packages/**/.turbo
-packages/**/*.test.*
-.git
-.github
-!.github/scripts
-*.tsbuildinfo
-docker/compose
-docker/**/Dockerfile
-.vscode
-packages/testing
+# Whitelist approach: ignore everything, then allow only what Docker builds need
+# This reduces build context from ~900MB to just what's required
+
+# Ignore everything first
+*
+
+# === n8n main image (docker/images/n8n/Dockerfile) ===
+!compiled
+!compiled/**
+!THIRD_PARTY_LICENSES.md
+
+# === runners image (docker/images/runners/Dockerfile + Dockerfile.distroless) ===
+!dist
+!dist/task-runner-javascript
+!dist/task-runner-javascript/**
+!packages
+!packages/@n8n
+!packages/@n8n/task-runner-python
+!packages/@n8n/task-runner-python/**
+
+# === Docker build files (entrypoints, configs) ===
+!docker
+!docker/images
+!docker/images/n8n
+!docker/images/n8n/docker-entrypoint.sh
+!docker/images/runners
+!docker/images/runners/n8n-task-runners.json

docker/images/n8n-base/Dockerfile

@@ -33,8 +33,7 @@ RUN echo "https://dl-cdn.alpinelinux.org/alpine/v3.22/main" >> /etc/apk/reposito
 # Install full-icu
 RUN npm install -g full-icu@1.5.0
 
-RUN rm -rf /tmp/* /root/.npm /root/.cache/node /opt/yarn* && \
-  apk del apk-tools
+RUN rm -rf /tmp/* /root/.npm /root/.cache/node
 
 # ==============================================================================
 # STAGE 2: Final Base Runtime Image
@@ -43,6 +42,8 @@ FROM node:${NODE_VERSION}-alpine
 
 COPY --from=builder / /
 
+RUN rm -rf /opt/yarn* && apk del apk-tools
+
 WORKDIR /home/node
 ENV NODE_ICU_DATA=/usr/local/lib/node_modules/full-icu
 EXPOSE 5678/tcp