ci: better use build matrix

Author: buchdag

.github/workflows/build-publish.yml

@@ -35,41 +35,25 @@ jobs:
       - name: Retrieve version
         run: echo "GIT_DESCRIBE=$(git describe --tags)" >> $GITHUB_ENV
 
-      - name: Get Docker tags for Alpine based image
-        if: ${{ matrix.base == 'alpine' }}
-        id: docker_meta_alpine
+      - name: Get Docker tags
+        id: docker_meta
         uses: docker/metadata-action@v4
         with:
           images: |
             ghcr.io/nginx-proxy/docker-gen
             nginxproxy/docker-gen
             jwilder/docker-gen
           tags: |
-            type=semver,pattern={{version}}
-            type=semver,pattern={{major}}.{{minor}}
-            type=raw,value=latest,enable={{is_default_branch}}
+            type=semver,pattern={{version}},enable=${{ matrix.base == 'alpine' }}
+            type=semver,pattern={{major}}.{{minor}},enable=${{ matrix.base == 'alpine' }}
+            type=semver,suffix=-debian,pattern={{version}},enable=${{ matrix.base == 'debian' }}
+            type=semver,suffix=-debian,pattern={{major}}.{{minor}},enable=${{ matrix.base == 'debian' }}
+            type=raw,value=latest,enable=${{ github.ref == 'refs/heads/main' && matrix.base == 'alpine' }}
+            type=raw,value=debian,enable=${{ github.ref == 'refs/heads/main' && matrix.base == 'debian' }}
           labels: |
             org.opencontainers.image.authors=Nicolas Duchon <nicolas.duchon@gmail.com> (@buchdag), Jason Wilder
             org.opencontainers.image.version=${{ env.GIT_DESCRIBE }}
 
-      - name: Get Docker tags for Debian based image
-        if: ${{ matrix.base == 'debian' }}
-        id: docker_meta_debian
-        uses: docker/metadata-action@v4
-        with:
-          images: |
-            ghcr.io/nginx-proxy/docker-gen
-            nginxproxy/docker-gen
-            jwilder/docker-gen
-          tags: |
-            type=semver,suffix=-debian,pattern={{version}}
-            type=semver,suffix=-debian,pattern={{major}}.{{minor}}
-            type=raw,value=debian,enable={{is_default_branch}}
-          labels: |
-            org.opencontainers.image.authors=Nicolas Duchon <nicolas.duchon@gmail.com> (@buchdag), Jason Wilder
-            org.opencontainers.image.version=${{ env.GIT_DESCRIBE }}
-          flavor: latest=false
-
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2
 
@@ -89,35 +73,17 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Build and push the Alpine based image
-        if: ${{ matrix.base == 'alpine' }}
-        id: docker_build_alpine
+      - name: Build and push the image
+        id: docker_build
         uses: docker/build-push-action@v4
         with:
           context: .
           build-args: DOCKER_GEN_VERSION=${{ env.GIT_DESCRIBE }}
           platforms: linux/amd64,linux/arm64,linux/arm/v7
+          file: Dockerfile.${{ matrix.base }}
           push: true
-          tags: ${{ steps.docker_meta_alpine.outputs.tags }}
-          labels: ${{ steps.docker_meta_alpine.outputs.labels }}
-
-      - name: Build and push the Debian based image
-        if: ${{ matrix.base == 'debian' }}
-        id: docker_build_debian
-        uses: docker/build-push-action@v4
-        with:
-          context: .
-          build-args: DOCKER_GEN_VERSION=${{ env.GIT_DESCRIBE }}
-          file: Dockerfile.debian
-          platforms: linux/amd64,linux/arm64,linux/arm/v7
-          push: true
-          tags: ${{ steps.docker_meta_debian.outputs.tags }}
-          labels: ${{ steps.docker_meta_debian.outputs.labels }}
-
-      - name: Alpine based image digest
-        if: ${{ matrix.base == 'alpine' }}
-        run: echo ${{ steps.docker_build_alpine.outputs.digest }}
+          tags: ${{ steps.docker_meta.outputs.tags }}
+          labels: ${{ steps.docker_meta.outputs.labels }}
 
-      - name: Debian based image digest
-        if: ${{ matrix.base == 'debian' }}
-        run: echo ${{ steps.docker_build_debian.outputs.digest }}
+      - name: Docker image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}