ci: enhance docker publish workflow for multi-arch support

Add support for building and publishing multi-architecture Docker images (amd64 and arm64) using a matrix strategy. Introduce a new 'prepare' job for metadata computation and a 'merge' job for creating manifest lists. Enable manual workflow dispatch with optional latest tagging. Improve caching and provenance handling for better efficiency and reliability.

.github/workflows/docker-publish.yml

@@ -1,27 +1,70 @@
-name: Build and Publish Docker Image
+name: Create and publish Docker images
 
 on:
   push:
     tags:
       - 'v*.*.*'
+  workflow_dispatch:
+    inputs:
+      use_latest_tag:
+        description: 'Tag as latest instead of branch name'
+        required: false
+        type: boolean
+        default: false
 
 env:
   REGISTRY: ghcr.io
-  IMAGE_NAME: richardr1126/openreader-webui
+
+permissions:
+  contents: read
 
 jobs:
+  prepare:
+    runs-on: ubuntu-24.04
+    outputs:
+      image_name: ${{ steps.image-name.outputs.image_name }}
+      tags: ${{ steps.meta.outputs.tags }}
+      labels: ${{ steps.meta.outputs.labels }}
+    steps:
+      - name: Compute lowercase image name
+        id: image-name
+        run: echo "image_name=${GITHUB_REPOSITORY,,}" >> "$GITHUB_OUTPUT"
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ steps.image-name.outputs.image_name }}
+          tags: |
+            type=raw,value=latest,enable=${{ (github.event_name == 'push' && !contains(github.ref, '-pre')) || (github.event_name == 'workflow_dispatch' && inputs.use_latest_tag == true) }},priority=1000
+            type=semver,pattern={{version}}
+            type=ref,event=tag
+            type=ref,event=branch,enable=${{ github.event_name == 'workflow_dispatch' && inputs.use_latest_tag != true }}
+
   build:
-    runs-on: ubuntu-latest
+    needs: prepare
+    runs-on: ${{ matrix.runner }}
     permissions:
+      actions: write
       contents: read
       packages: write
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - arch: amd64
+            platform: linux/amd64
+            runner: ubuntu-24.04
+          - arch: arm64
+            platform: linux/arm64
+            runner: ubuntu-24.04-arm
 
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
-
+        with:
-      - name: Set up QEMU
+          ref: ${{ github.sha }}
-        uses: docker/setup-qemu-action@v3
+          fetch-depth: 0
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -33,22 +76,76 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Extract metadata for Docker
+      - name: Build and push Docker image (${{ matrix.arch }})
-        id: meta
+        id: build
-        uses: docker/metadata-action@v5
-        with:
-          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
-          tags: |
-            type=raw,value=latest,enable=${{ !contains(github.ref, '-pre') }}
-            type=semver,pattern={{version}}
-
-      - name: Build and push Docker image
         uses: docker/build-push-action@v5
         with:
           context: .
-          platforms: linux/amd64,linux/arm64
+          platforms: ${{ matrix.platform }}
-          push: true
+          labels: ${{ needs.prepare.outputs.labels }}
-          tags: ${{ steps.meta.outputs.tags }}
+          cache-from: type=gha,scope=${{ matrix.arch }}
-          labels: ${{ steps.meta.outputs.labels }}
+          cache-to: type=gha,mode=max,scope=${{ matrix.arch }}
-          cache-from: type=gha
+          provenance: false
-          cache-to: type=gha,mode=max
+          outputs: type=image,name=${{ env.REGISTRY }}/${{ needs.prepare.outputs.image_name }},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.arch }}
+          path: /tmp/digests
+          if-no-files-found: error
+          retention-days: 1
+
+  merge:
+    needs: [prepare, build]
+    runs-on: ubuntu-24.04
+    permissions:
+      actions: read
+      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: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Create manifest list and push
+        working-directory: /tmp/digests
+        run: |
+          docker buildx imagetools create \
+            $(echo "$TAGS" | xargs -I {} echo -t {}) \
+            $(printf '${{ env.REGISTRY }}/${{ needs.prepare.outputs.image_name }}@sha256:%s ' *)
+        env:
+          TAGS: ${{ needs.prepare.outputs.tags }}
+
+      - name: Output build information
+        run: |
+          echo "✅ Docker images built and pushed successfully!"
+          echo "🐋 Images:"
+          echo '${{ needs.prepare.outputs.tags }}' | sed 's/^/  - /'
+          echo "📝 Event: ${{ github.event_name }}"
+          if [ "${{ github.event_name }}" == "workflow_dispatch" ]; then
+            echo "📝 Triggered by manual workflow dispatch on branch: ${{ github.ref_name }}"
+            echo "📝 use_latest_tag: ${{ inputs.use_latest_tag }}"
+          else
+            echo "📝 Triggered by tag: ${{ github.ref_name }}"
+          fi