Fix branch name

.github/workflows/docker-build.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v3
         with:
-          ref: github.event.workflow_run.outputs.branch
+          ref: "${{ github.event.workflow_run.outputs.branch }}"
           fetch-depth: 0  # Fetch the entire history to ensure 'HEAD^' is resolvable
 
       - name: Debug github refs
@@ -34,7 +34,7 @@ jobs:
       - name: Check if Dockerfile or requirements.txt was changed
         id: check_dependencies
         run: |
-          if git diff --name-only github.event.workflow_run.outputs.branch | grep -q -e 'Dockerfile' -e 'requirements.txt'; then
+          if git diff --name-only "${{ github.event.workflow_run.outputs.branch }}" | grep -q -e 'Dockerfile' -e 'requirements.txt'; then
             echo "Dockerfile or requirements.txt changed"
             echo "::set-output name=updated::true"
           else