fix: Invalid reference format for docker builds

Author: nssherpa

.github/workflows/publish-docker.yml

@@ -94,9 +94,9 @@ jobs:
           tags: |
             # For PRs: pr-123
             type=ref,event=pr
-            # For main branch: latest, main, and sha
+            # For branches: branch name (main, develop, etc)
             type=ref,event=branch
-            type=sha,prefix={{branch}}-
+            # For main branch: latest tag
             type=raw,value=latest,enable={{is_default_branch}}
             # For tags: v1.2.3 -> 1.2.3, 1.2, 1
             type=semver,pattern={{version}}