Refine github workflow to publish tagged image on tag

.github/workflows/docker-publish.yml → .github/workflows/docker-publish-latest-commit.yml

@@ -31,13 +31,6 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Build and export to ghcr
-        uses: docker/build-push-action@v3
-        with:
-          context: .
-          load: true
-          tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
-
       - name: Build and push image to github container registry
         uses: docker/build-push-action@v3
         with:

.github/workflows/docker-publish-tags.yml

@@ -0,0 +1,45 @@
+name: Build on tags
+
+on:
+  push:
+    tags: [ '*']
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    #--- Set permissions to ephemeral GITHUB_TOKEN for job actions
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout and download repository to workflow runner
+        uses: actions/checkout@v3
+
+      - name: Set up docker buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to github container registry
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      #See https://stackoverflow.com/a/70468025/1484823 about fetching and formatting tags in current commit
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push image to github container registry
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          push: true
+          tags:  ${{ steps.meta.outputs.labels }}