Add "latest" tag, but only for final releases

using combination of a standard GHA action
and our custom code (as it doesn't support
PEP440-compatible versioning)

.github/workflows/publish-docker.yml

@@ -29,18 +29,44 @@ jobs:
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      # we want just the version as a tag, so remove the 'refs/tags/v' prefix
-      - run: |
-          version="${github_ref/refs\/tags\/v/}"
-          echo "version=$version" >> $GITHUB_ENV
-        env:
-         github_ref: ${{ github.ref }}
+      - name: Get tags
+        shell: python
+        run: |
+          import re
+          from packaging.version import parse
+
+          version = "${{ github.ref }}".replace("refs/tags/v", "")
+          image = "${{ github.repository }}"
+
+          tags = set()
+
+          # full version
+          tags.add(f"{image}:{version}")
+
+          if not parse(version).is_prerelease:
+              # only final and post-releases should get the tags
+              # used for automatic use of latest *stable* version
+
+              # major_version
+              major_version = re.search(r'(\d+?)\.', version).group(1)
+              tags.add(f"{image}:{major_version}")
+
+              # major_version.minor_version
+              major_and_minor_version = re.search(r'(\d+?\.\d+?)\.', version).group(1)
+              tags.add(f"{image}:{major_and_minor_version}")
+
+              tags.add(f"{image}:latest")
+
+          tags = ",".join(sorted(list(tags)))
+
+          print(f"::set-output name=tags::{tags}")
+
+        id: tags
 
       - name: Build and push
         uses: docker/build-push-action@v2
         with:
           context: .
           platforms: linux/amd64
           push: true
-          tags: |
-            ghcr.io/voxpupuli/puppetboard:${{ env.version }}
+          tags: ${{ steps.tags.outputs.tags }}

puppetboard/version.py

@@ -2,4 +2,4 @@
 # Puppetboard version module
 #
 
-__version__ = '3.1.0.post2'
+__version__ = '3.1.0.post3'