refactor: remove SHA-only Docker tags

- Remove standalone SHA tags to prevent DockerHub clutter
- Keep clean branch names and branch+SHA tags for useful scenarios
- Maintain manageable tag strategy for long-term development

Author: VargaJoe

.github/workflows/docker-image.yml

@@ -38,14 +38,14 @@ jobs:
         with:
           images: sensenetcsp/sn-client
           tags: |
-            # Branch name (replace slashes with hyphens)
+            # Clean branch name (e.g., feature-docker-containerization)
+            type=ref,event=branch
+            # Branch name with SHA (e.g., feature-docker-containerization-abc1234)
             type=ref,event=branch,suffix=-{{sha}}
             # Latest tag for main branch
             type=raw,value=latest,enable={{is_default_branch}}
             # PR number for pull requests
             type=ref,event=pr
-            # Short SHA for current commit
-            type=sha,prefix=sha-
 
       - name: Login to DockerHub
         if: steps.check_dockerfile.outputs.dockerfile_exists == 'true'