fix: configure token so that CI job can push branches

Signed-off-by: Esteve Fernandez <[email protected]>

Author: esteve

.github/workflows/generate-bindings.yml

@@ -38,6 +38,9 @@ jobs:
             ros_distribution: rolling
             ros_version: 2
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
     container:
       image: ${{ matrix.docker_image }}
     steps:
@@ -67,16 +70,24 @@ jobs:
 
     - name: Submit PR
       run: |
+        if git diff --exit-code; then
+          exit 0
+        fi
         git config --global user.email "[email protected]"
         git config --global user.name "GitHub Action"
+        git remote set-url origin https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/${{ github.repository }}
+        git remote update origin
         CREATE_PR=0
         if !git checkout update-bindings-${{ matrix.ros_distribution }}; then
           CREATE_PR=1
           git checkout -b update-bindings-${{ matrix.ros_distribution }}
         fi
-        git add .
+        git add rclrs/src/rcl_bindings_generated_${{ matrix.ros_distribution }}.rs
         git commit -m "Regenerate bindings for ${{ matrix.ros_distribution }}"
         git push -u origin update-bindings-${{ matrix.ros_distribution }}
         if [ $CREATE_PR -eq 1 ]; then
           gh pr create --base main --head update-bindings-${{ matrix.ros_distribution }} --title "Regenerate bindings for ${{ matrix.ros_distribution }}" --body "This PR regenerates the bindings for ${{ matrix.ros_distribution }}."
-        fi
+        fi
+      env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}