Improve Docker image tagging strategy and remove Swagger version

- Replace 'stable' tag with semver-based tags (1.2.3, 1.2, 1)
- Use 'edge' tag for main branch instead of 'latest'
- Reserve 'latest' tag only for tagged releases
- Remove version from Swagger docs (tracked via git tags instead)
- Document available image tags in README

.github/workflows/docker-publish.yml

@@ -80,10 +80,12 @@ jobs:
       with:
         images: ghcr.io/${{ github.repository }}
         tags: |
-          type=ref,event=tag
+          type=semver,pattern={{version}}
+          type=semver,pattern={{major}}.{{minor}}
+          type=semver,pattern={{major}}
           type=sha,prefix=sha-
-          type=raw,value=latest,enable={{is_default_branch}}
-          type=raw,value=stable,enable=${{ startsWith(github.ref, 'refs/tags/v') }}
+          type=raw,value=edge,enable={{is_default_branch}}
+          type=raw,value=latest,enable=${{ startsWith(github.ref, 'refs/tags/v') }}
 
     - name: Build and push
       uses: docker/build-push-action@v5