fix github build action

Author: danielraab

.github/workflows/docker-build.yml

@@ -39,7 +39,7 @@ jobs:
             type=semver,pattern={{version}}
             type=semver,pattern={{major}}.{{minor}}
             type=semver,pattern={{major}}
-            type=sha,prefix={{branch}}-
+            type=sha
             type=raw,value=latest,enable={{is_default_branch}}
 
       - name: Build and push Docker image