ci: first pass at ci builds

.github/workflows/build.yml

@@ -0,0 +1,31 @@
+on:
+  workflow_dispatch:
+  push:
+    branches: 'master'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+      steps:
+        - name: Checkout
+          uses: actions/checkout@v4
+      
+        - name: Set Node.js 18.x
+          uses: actions/setup-node@v3
+          with:
+            node-version: 18.x
+        
+        - name: Get JS deps
+          uses: borales/actions-yarn@v4
+          with:
+            cmd: install
+            
+        - name: Get Composer deps
+          uses: php-actions/composer@v6
+          with:
+            command: install
+
+        - name: Upload artifacts
+            uses: actions/upload-pages-artifact@v3
+            with:
+              path: '.'