workflows: split container builds per-arch

.github/workflows/call-build-images.yaml

@@ -33,11 +33,6 @@
         type: string
         required: false
         default: ""
-      platforms:
-        description: The platforms to build for
-        type: string
-        required: false
-        default: 'linux/amd64, linux/arm64, linux/arm/v7, linux/s390x'
     secrets:
       token:
         description: The Github token or similar to authenticate with for the registry.
@@ -74,25 +69,34 @@
           replace-with: "$1"
           flags: "g"
 
-  # This is the intended approach to multi-arch image and all the other checks scanning,
-  # signing, etc only trigger from this.
-  call-build-images:
-    needs:
-      - call-build-images-meta
-    name: Multiarch container images to GHCR
-    runs-on: ubuntu-latest-8-cores
-    environment: ${{ inputs.environment }}
+  # Taken from https://docs.docker.com/build/ci/github-actions/multi-platform/#distribute-build-across-multiple-runners
+  # We split this out to make it easier to restart just one of them if it fails and do all in parallel
+  call-build-single-arch-container-images:
+    # Allow us to continue to create a manifest if we want
+    continue-on-error: true
     permissions:
       contents: read
       packages: write
-    outputs:
-      production-digest: ${{ steps.build_push.outputs.digest }}
-      debug-digest: ${{ steps.debug_build_push.outputs.digest }}
+    strategy:
+      fail-fast: false
+      matrix:
+        platform:
+          - amd64
+          - arm64
+          - arm/v7
+          - s390x
+        target:
+          - production
+          - debug
+    name: ${{ matrix.platform }} container image build for ${{ matrix.target }}
+    # Use GitHub Actions ARM hosted runners
+    runs-on: ${{ (contains(matrix.platform, 'arm') && 'ubuntu-22.04-arm') || 'ubuntu-latest' }}
     steps:
-      - name: Checkout code for modern style builds
+      - name: Checkout code
         uses: actions/checkout@v4
         with:
           ref: ${{ inputs.ref }}
+          token: ${{ secrets.token }}
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
@@ -103,30 +107,20 @@
       - name: Log in to the Container registry
         uses: docker/login-action@v3
         with:
-          registry: ${{ inputs.registry }}
-          username: ${{ inputs.username }}
+          registry: ghcr.io
+          username: ${{ github.actor }}
           password: ${{ secrets.token }}
 
-      - name: Extract metadata from Github
-        id: meta
-        uses: docker/metadata-action@v5
-        with:
-          images: ${{ inputs.registry }}/${{ inputs.image }}
-          tags: |
-            raw,${{ inputs.version }}
-            raw,${{ needs.call-build-images-meta.outputs.major-version }}
-            raw,latest
-
-      - name: Build the production images
-        id: build_push
+      - name: Build and push by digest the standard ${{ matrix.target }} image
+        id: build
         uses: docker/build-push-action@v6
         with:
+          # Use path context rather than Git context as we want local files
           file: ./dockerfiles/Dockerfile
           context: .
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
-          platforms: ${{ inputs.platforms }}
-          target: production
+          target: ${{ matrix.target }}
+          outputs: type=image,name=${{ inputs.registry }}/${{ inputs.image }},push-by-digest=true,name-canonical=true,push=true
+          platforms: linux/${{ matrix.platform }}
           # Must be disabled to provide legacy format images from the registry
           provenance: false
           push: true
@@ -135,6 +129,82 @@
             FLB_NIGHTLY_BUILD=${{ inputs.unstable }}
             RELEASE_VERSION=${{ inputs.version }}
 
+      - name: Export ${{ matrix.target }} digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"
+        shell: bash
+
+      - name: Upload ${{ matrix.target }} digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.target }}-digests-${{ (contains(matrix.platform, 'arm/v7') && 'arm-v7') || matrix.platform }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  # Take the digests and produce a multi-arch manifest from them.
+  call-build-container-image-manifests:
+    permissions:
+      contents: read
+      packages: write
+    name: Upload multi-arch container image manifests
+    runs-on: ubuntu-latest
+    needs:
+      - call-build-images-meta
+      - call-build-single-arch-container-images
+    steps:
+      - name: Extract metadata from Github
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ inputs.registry }}/${{ inputs.image }}
+          tags: |
+            raw,${{ inputs.version }}
+            raw,${{ needs.call-build-images-meta.outputs.major-version }}
+            raw,latest
+
+      - name: Download production digests
+        uses: actions/download-artifact@v4
+        with:
+          pattern: production-digests-*
+          path: /tmp/production-digests
+          merge-multiple: true
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.token }}
+
+      - name: Create production manifest
+        run: |
+          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+            $(printf '${{ inputs.registry }}/${{ inputs.image }}@sha256:%s ' *)
+        shell: bash
+        working-directory: /tmp/production-digests
+
+      - name: Inspect image
+        run: |
+          docker buildx imagetools inspect ${{ inputs.registry }}/${{ inputs.image }}:${{ steps.meta.outputs.version }}
+        shell: bash
+
+  # Take the digests and produce a multi-arch manifest from them.
+  call-build-debug-container-image-manifests:
+    permissions:
+      contents: read
+      packages: write
+    name: Upload debug multi-arch container image manifests
+    runs-on: ubuntu-latest
+    needs:
+      - call-build-images-meta
+      - call-build-single-arch-container-images
+    steps:
       - id: debug-meta
         uses: docker/metadata-action@v5
         with:
@@ -144,28 +214,39 @@
             raw,${{ needs.call-build-images-meta.outputs.major-version }}-debug
             raw,latest-debug
 
-      - name: Build the debug multi-arch images
-        id: debug_build_push
-        uses: docker/build-push-action@v6
+      - name: Download debug digests
+        uses: actions/download-artifact@v4
         with:
-          file: ./dockerfiles/Dockerfile
-          context: .
-          tags: ${{ steps.debug-meta.outputs.tags }}
-          labels: ${{ steps.debug-meta.outputs.labels }}
-          platforms: ${{ inputs.platforms }}
-          # Must be disabled to provide legacy format images from the registry
-          provenance: false
-          target: debug
-          push: true
-          load: false
-          build-args: |
-            FLB_NIGHTLY_BUILD=${{ inputs.unstable }}
-            RELEASE_VERSION=${{ inputs.version }}
+          pattern: production-digests-*
+          path: /tmp/debug-digests
+          merge-multiple: true
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.token }}
+
+      - name: Create debug manifest
+        run: |
+          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+            $(printf '${{ inputs.registry }}/${{ inputs.image }}@sha256:%s ' *)
+        shell: bash
+        working-directory: /tmp/debug-digests
+
+      - name: Inspect image
+        run: |
+          docker buildx imagetools inspect ${{ inputs.registry }}/${{ inputs.image }}:${{ steps.debug-meta.outputs.version }}
+        shell: bash
 
   call-build-images-generate-schema:
     needs:
       - call-build-images-meta
-      - call-build-images
+      - call-build-container-image-manifests
     runs-on: ubuntu-latest
     environment: ${{ inputs.environment }}
     permissions:
@@ -195,7 +276,7 @@
   call-build-images-scan:
     needs:
       - call-build-images-meta
-      - call-build-images
+      - call-build-container-image-manifests
     name: Trivy + Dockle image scan
     runs-on: ubuntu-latest
     environment: ${{ inputs.environment }}
@@ -230,7 +311,7 @@
   call-build-images-sign:
     needs:
       - call-build-images-meta
-      - call-build-images
+      - call-build-container-image-manifests
     name: Deploy and sign multi-arch container image manifests
     permissions:
       contents: read
@@ -250,7 +331,7 @@
         # sigstore community Rekor transparency log.
         #
         # We use recursive signing on the manifest to cover all the images.
         run: |
           cosign sign --recursive \
             -a "repo=${{ github.repository }}" \
             -a "workflow=${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}" \