Tag on main as main-<sha>, and tag on tags as v0, v0.0, `v0.0…

….0`, and `latest`

.github/workflows/docker.yml

@@ -6,7 +6,7 @@ on:
       - main
     tags:
       - '**'
-  # Note: Remove this before merging
+  # TODO: Remove pull_request before merging
   pull_request:
     branches:
       - main
@@ -61,6 +61,26 @@ jobs:
           TAG=$( git describe --tags --dirty ) # E.g. v1.2.0-23-g60ee190
           echo "TAG=$TAG" >> $GITHUB_ENV
 
+      # This step generates the docker tags
+      # type=ref,event=branch generates tag(s) on branch only
+      # type=semver generates tag(s) on tags only
+      # TODO: Remove `type=ref,event=pr` before merging PR
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: |
+            ${{ github.repository }}
+            ghcr.io/${{ github.repository }}
+          tags: |
+            type=ref,event=pr
+            # On main. E.g. main-abc01234
+            type=ref,suffix=-{{sha}},event=branch
+            # On tags. E.g. 'v0', 'v0.0', 'v0.0.0', and 'latest'
+            type=semver,pattern=v{{major}}
+            type=semver,pattern=v{{major}}.{{minor}}
+            type=semver,pattern=v{{major}}.{{minor}}.{{patch}}
+
       # See: https://github.com/docker/build-push-action/blob/v2.6.1/docs/advanced/cache.md#github-cache
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2
@@ -97,45 +117,9 @@ jobs:
       - run: |
           ls -al release*/
 
-      - name: Build (PRs)
-        id: docker_build_pr
-        # Run only on pull requests
-        if: github.event_name == 'pull_request'
-        uses: docker/build-push-action@v3
-        with:
-          build-args: |
-            TAG=${{ env.TAG }}
-          context: '.'
-          file: Dockerfile
-          platforms: linux/amd64,linux/arm,linux/arm64,linux/mips64le,linux/ppc64le,linux/riscv64,linux/s390x
-          push: true
-          tags: |
-            ${{ github.repository }}:${{ env.TAG }}
-            ghcr.io/${{ github.repository }}:${{ env.TAG }}
-          cache-from: type=local,src=/tmp/.buildx-cache
-          cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max
-
-      - name: Build and push (main)
-        id: docker_build_main
-        # Run only on main
-        if: github.ref == 'refs/heads/main'
-        uses: docker/build-push-action@v3
-        with:
-          build-args: |
-            TAG=${{ env.TAG }}
-          context: '.'
-          file: Dockerfile
-          platforms: linux/amd64,linux/arm,linux/arm64,linux/mips64le,linux/ppc64le,linux/riscv64,linux/s390x
-          push: true
-          tags: |
-            ${{ github.repository }}:${{ env.TAG }}
-            ghcr.io/${{ github.repository }}:${{ env.TAG }}
-          cache-from: type=local,src=/tmp/.buildx-cache
-          cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max
-
-      - name: Build and push (release)
-        id: docker_build_release
-        if: startsWith(github.ref, 'refs/tags/')
+      - name: Build and push
+        # TODO: Remove pull_request before merging
+        if: github.event_name == 'pull_request' || github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/')
         uses: docker/build-push-action@v3
         with:
           build-args: |
@@ -144,11 +128,7 @@ jobs:
           file: Dockerfile
           platforms: linux/amd64,linux/arm,linux/arm64,linux/mips64le,linux/ppc64le,linux/riscv64,linux/s390x
           push: true
-          tags: |
-            ${{ github.repository }}:${{ env.TAG }}
-            ${{ github.repository }}:latest
-            ghcr.io/${{ github.repository }}:${{ env.TAG }}
-            ghcr.io/${{ github.repository }}:latest
+          tags: ${{ steps.prep.outputs.tags }}
           cache-from: type=local,src=/tmp/.buildx-cache
           cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max