Configure CI workflow to run only on GitHub and improve Docker tagging strategy

- Add github.server_url check to prevent workflow execution on Gitea
- Implement clear separation between development (latest) and production (stable) tags
- Use stable tag only for versioned releases (v*)
- Add sha- prefix to commit-based tags for better clarity
- Remove redundant branch name tags

.github/workflows/docker-publish.yml

@@ -11,6 +11,7 @@ jobs:
   test:
     name: Test
     runs-on: ubuntu-latest
+    if: github.server_url == 'https://github.com'
     steps:
     - uses: actions/checkout@v4
 
@@ -34,6 +35,7 @@ jobs:
   lint:
     name: Lint
     runs-on: ubuntu-latest
+    if: github.server_url == 'https://github.com'
     steps:
     - uses: actions/checkout@v4
 
@@ -57,7 +59,7 @@ jobs:
     name: Build and Push Docker Image
     runs-on: ubuntu-latest
     needs: [test, lint]
-    if: github.event_name == 'push'
+    if: github.event_name == 'push' && github.server_url == 'https://github.com'
     permissions:
       contents: read
       packages: write
@@ -78,10 +80,10 @@ jobs:
       with:
         images: ghcr.io/${{ github.repository }}
         tags: |
-          type=ref,event=branch
           type=ref,event=tag
-          type=sha
+          type=sha,prefix=sha-
           type=raw,value=latest,enable={{is_default_branch}}
+          type=raw,value=stable,enable=${{ startsWith(github.ref, 'refs/tags/v') }}
 
     - name: Build and push
       uses: docker/build-push-action@v5