feat: enhance Docker build process with multi-platform support and caching

Signed-off-by: Noste <83548733+Noooste@users.noreply.github.com>

.github/workflows/build.yml

@@ -11,11 +11,20 @@ jobs:
     permissions:
       contents: read
       packages: write
+    strategy:
+      fail-fast: false
+      matrix:
+        platform:
+          - linux/amd64
+          - linux/arm64
 
     steps:
       - name: Checkout repository
         uses: actions/checkout@v6
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
@@ -34,16 +43,72 @@ jobs:
           tags: |
             type=semver,pattern={{raw}}
             type=raw,value=latest
-      - name: Build and push Docker image
+
+      - name: Build and push by digest
+        id: build
         uses: docker/build-push-action@v5
         with:
           context: .
-          push: true
-          tags: ${{ steps.meta.outputs.tags }}
+          platforms: ${{ matrix.platform }}
           labels: ${{ steps.meta.outputs.labels }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
-          platforms: linux/amd64,linux/arm64
+          cache-from: type=gha,scope=build-${{ matrix.platform }}
+          cache-to: type=gha,mode=max,scope=build-${{ matrix.platform }}
+          outputs: type=image,name=${{ secrets.DOCKER_REGISTRY }},push-by-digest=true,name-canonical=true,push=true
 
-      - name: Image digest
-        run: echo ${{ steps.meta.outputs.digest }}
+      - name: Export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"
+
+      - name: Upload digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ strategy.job-index }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  merge:
+    runs-on: ubuntu-latest
+    needs: build
+    permissions:
+      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: Log in to Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: docker.io
+          username: ${{ secrets.DOCKER_LOGIN }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ secrets.DOCKER_REGISTRY }}
+          tags: |
+            type=semver,pattern={{raw}}
+            type=raw,value=latest
+
+      - name: Create manifest list and push
+        working-directory: /tmp/digests
+        run: |
+          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+            $(printf '${{ secrets.DOCKER_REGISTRY }}@sha256:%s ' *)
+
+      - name: Inspect image
+        run: |
+          docker buildx imagetools inspect ${{ secrets.DOCKER_REGISTRY }}:${{ steps.meta.outputs.version }}