Multi stage build

.github/workflows/container.yml

@@ -10,50 +10,94 @@ on:
   workflow_dispatch:
 
 jobs:
-  main:
+  build:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        platform: [linux/amd64, linux/386, linux/arm64, linux/arm/v6, linux/arm/v7]
     steps:
-      - name: Checkout Repository
-        uses: actions/checkout@v2
+      - name: Declare platform
+        run: |
+          platform=${{ matrix.platform }}
+          echo "PLATFORM=${platform//\//-}" >> $GITHUB_ENV
 
-      - name: Calculate Container Metadata
+      - name: Calculate container metadata
         id: meta
-        uses: docker/metadata-action@v4
+        uses: docker/metadata-action@v5
         with:
           images: ghcr.io/${{ github.repository }}
 
       - name: Setup QEMU
-        uses: docker/setup-qemu-action@v2
+        uses: docker/setup-qemu-action@v3
 
       - name: Setup Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
 
       - name: Login to GitHub Container Registry
-        if: ${{ github.event_name != 'pull_request' }}
         uses: docker/login-action@v2
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Build Images
-        if: ${{ github.event_name == 'pull_request' }}
-        uses: docker/build-push-action@v3
+      - name: Build images and push by digest
+        id: build
+        uses: docker/build-push-action@v6
         with:
-          context: .
-          platforms: linux/amd64, linux/386, linux/arm64, linux/arm/v6, linux/arm/v7
-          cache-from: type=registry,ref=ghcr.io/${{ github.repository }}:buildcache
-          tags: ${{ steps.meta.outputs.tags }}
+          platforms: ${{ matrix.platform }}
           labels: ${{ steps.meta.outputs.labels }}
-
-      - name: Build and Push Images
+          outputs: type=image,name=ghcr.io/${{ github.repository }},push-by-digest=true,name-canonical=true,push=${{ github.event_name != 'pull_request' && 'true' || 'false' }}
+
+      - name: Export digest
         if: ${{ github.event_name != 'pull_request' }}
-        uses: docker/build-push-action@v3
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"
+
+      - name: Upload digest
+        if: ${{ github.event_name != 'pull_request' }}
+        uses: actions/upload-artifact@v4
         with:
-          context: .
-          platforms: linux/amd64, linux/386, linux/arm64, linux/arm/v6, linux/arm/v7
-          cache-from: type=registry,ref=ghcr.io/${{ github.repository }}:buildcache
-          cache-to: type=registry,ref=ghcr.io/${{ github.repository }}:buildcache,mode=max
-          push: true
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
+          name: digests-${{ env.PLATFORM }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  merge:
+    if: ${{ github.event_name != 'pull_request' }}
+    runs-on: ubuntu-latest
+    needs: [build]
+    steps:
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: /tmp/digests
+          pattern: digests-*
+          merge-multiple: true
+
+      - name: Calculate container metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository }}
+
+      - name: Setup Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Create and push manifest
+        working-directory: /tmp/digests
+        run: |
+          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+            $(printf 'ghcr.io/${{ github.repository }}@sha256:%s ' *)
+
+      - name: Inspect container image
+        run: |
+          docker buildx imagetools inspect ghcr.io/${{ github.repository }}:${{ steps.meta.outputs.version }}

Dockerfile

@@ -27,6 +27,7 @@ COPY auto_rx/requirements.txt \
 
 # Install Python packages.
 RUN pip3 install \
+  --extra-index-url https://www.piwheels.org/simple \
   --user --break-system-packages --no-warn-script-location --ignore-installed \
   -r /root/radiosonde_auto_rx/auto_rx/requirements.txt