[CI] Add dependabot support and labeler workflow (#162)

Add dependabot support and labeler workflow

---------

Signed-off-by: Yuanhao Ji <jiyuanhao@apache.org>

.github/workflows/image.yml

@@ -80,7 +80,7 @@ jobs:
       uses: docker/setup-buildx-action@v2
 
     - name: Publish - Login to Quay Container Registry
-      if: ${{ github.event_name == 'push' }}
+      if: ${{ github.event_name == 'push' && github.repository_owner == 'vllm-project' }}
       uses: docker/login-action@v3
       with:
         registry: quay.io
@@ -94,7 +94,7 @@ jobs:
         cache-from: type=gha
         cache-to: type=gha,mode=max
         # only trigger when tag, branch/main push
-        push: ${{ github.event_name != 'pull_request' }}
+        push: ${{ github.event_name == 'push' && github.repository_owner == 'vllm-project' }}
         labels: ${{ steps.meta.outputs.labels }}
         tags: ${{ steps.meta.outputs.tags }}
         build-args: |

.github/workflows/labeler.yml

@@ -0,0 +1,18 @@
+name: Pull Request Labeler
+
+on: pull_request_target
+
+jobs:
+  label:
+    name: Label
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - name: Label the PR
+        uses: actions/labeler@v5
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          configuration-path: .github/labeler.yml
+          sync-labels: true