fix: multi-arch digest issue (#35)

.github/workflows/docker-build.yml

@@ -19,61 +19,11 @@ env:
   REGISTRY_IMAGE: ghcr.io/${{ github.repository }}
 
 jobs:
-  build-amd64:
+  build:
     runs-on: ubuntu-latest
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-
-      - name: Docker meta
-        id: meta
-        uses: docker/metadata-action@v5
-        with:
-          images: ${{ env.REGISTRY_IMAGE }}
-          tags: |
-            type=raw,value=${{ inputs.release_tag_name }}
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
-      - name: Login to GitHub Container Registry
-        uses: docker/login-action@v2
-        with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Build and push
-        id: build-amd64
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          file: Dockerfile
-          labels: ${{ steps.meta.outputs.labels }}
-          cache-from: type=registry,ref=${{ env.REGISTRY_IMAGE }}:cache-amd64
-          cache-to: type=registry,ref=${{ env.REGISTRY_IMAGE }}:cache-amd64,mode=max
-          outputs: type=image,name=${{ env.REGISTRY_IMAGE }},push-by-digest=true,name-canonical=true,push=true
-
-      - name: Export digests
-        run: |
-          mkdir -p /tmp/digests
-          digest="${{ steps.build-amd64.outputs.digest }}"
-          touch "/tmp/digests/${digest#sha256:}"
-
-      - name: Upload digest
-        uses: actions/upload-artifact@v3
-        with:
-          name: digests
-          path: /tmp/digests/*
-          if-no-files-found: error
-          retention-days: 1
-
-  build-arm64:
-    runs-on: ubuntu-latest
-
+    strategy:
+      matrix:
+        platform: [amd64, arm64]
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -92,7 +42,7 @@ jobs:
         uses: docker/setup-qemu-action@v3
         with:
           image: tonistiigi/binfmt:latest
-          platforms: linux/amd64,linux/arm64
+          platforms: ${{ format('linux/{0}', matrix.platform) }}
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -105,21 +55,21 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push
-        id: build-arm64
+        id: build
         uses: docker/build-push-action@v6
         with:
           context: .
           file: Dockerfile
-          platforms: linux/arm64
+          platforms:  ${{ format('linux/{0}', matrix.platform) }}
           labels: ${{ steps.meta.outputs.labels }}
-          cache-from: type=registry,ref=${{ env.REGISTRY_IMAGE }}:cache-arm64
-          cache-to: type=registry,ref=${{ env.REGISTRY_IMAGE }}:cache-arm64,mode=max
+          cache-from: type=registry,ref=${{ env.REGISTRY_IMAGE }}:cache-${{ matrix.platform }},mode=max
+          cache-to: type=registry,ref=${{ env.REGISTRY_IMAGE }}:cache-${{ matrix.platform }},mode=max
           outputs: type=image,name=${{ env.REGISTRY_IMAGE }},push-by-digest=true,name-canonical=true,push=true
 
       - name: Export digest
         run: |
           mkdir -p /tmp/digests
-          digest="${{ steps.build-arm64.outputs.digest }}"
+          digest="${{ steps.build.outputs.digest }}"
           touch "/tmp/digests/${digest#sha256:}"
 
       - name: Upload digest
@@ -133,8 +83,7 @@ jobs:
   merge:
     runs-on: ubuntu-latest
     needs:
-      - build-amd64
-      - build-arm64
+      - build
     steps:
       - name: Download digests
         uses: actions/download-artifact@v3