fix: use sha- prefix for Docker tags to avoid invalid reference format

Author: ry-ops

.github/workflows/docker-build-push.yml

@@ -57,7 +57,7 @@ jobs:
             type=semver,pattern={{major}}.{{minor}}
             type=raw,value=latest,enable={{is_default_branch}}
             type=raw,value=${{ inputs.tag }},enable=${{ inputs.tag != '' }}
-            type=sha,prefix={{branch}}-
+            type=sha,prefix=sha-
 
       - name: Build and push Docker image
         id: build-push
@@ -79,4 +79,4 @@ jobs:
         run: |
           echo "Image pushed successfully!"
           echo "To update K3s deployment, run:"
-          echo "kubectl rollout restart deployment/<deployment-name> -n <namespace>"
+          echo "kubectl rollout restart deployment/<deployment-name> -n <namespace>"