maintenance: Improve workflow robustness and feedback

This commit introduces two main improvements to the GitHub Actions workflows:

1.  **Emoji Reaction for Issue Comments:**
    The `get-pr-info` reusable action now automatically adds an "eyes" (👀) emoji reaction to any issue comment that triggers a workflow. This provides immediate visual feedback to the user that their command has been acknowledged. This logic is centralized in the reusable action, ensuring it is applied consistently across all workflows that use it.

2.  **Robust Concurrent Push Handling:**
    The `handle-fix-commit` reusable action has been enhanced to gracefully handle race conditions where multiple workflows attempt to push to the same branch simultaneously. The third-party `EndBug/add-and-commit` action has been replaced with a custom script that implements a "rebase and retry" mechanism. If a push fails, the script will automatically fetch the latest changes, rebase the local commit, and retry the push, attempting this up to five times before failing. This prevents silent failures and makes the "fix" workflows more reliable.

Author: google-labs-jules[bot]

.github/actions/get-pr-info/action.yaml

@@ -25,3 +25,14 @@ runs:
           core.setOutput('ref', pr.data.head.ref);
           core.setOutput('sha', pr.data.head.sha);
           core.setOutput('repo', pr.data.head.repo.full_name);
+    - name: React to comment
+      uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+      continue-on-error: true
+      with:
+        script: |
+          github.rest.reactions.createForIssueComment({
+            owner: context.repo.owner,
+            repo: context.repo.repo,
+            comment_id: context.payload.comment.id,
+            content: 'eyes'
+          });

.github/actions/handle-fix-commit/action.yaml

@@ -53,21 +53,40 @@ runs:
           core.setOutput('maintainer_can_modify', pr.maintainer_can_modify);
     - name: Commit fixes
       if: steps.check_changes.outputs.changes == 'true' && (inputs.pr-info-repo == github.repository || steps.pr-properties.outputs.maintainer_can_modify == 'true')
-      uses: EndBug/add-and-commit@a94899bca583c204427a224a7af87c02f9b325d5 # v9.1.4
-      id: add_and_commit
-      with:
-        token: ${{ inputs.token }}
-        cwd: ${{ inputs.working-directory }}
-        author_name: "github-actions[bot]"
-        author_email: "41898282+github-actions[bot]@users.noreply.github.com"
-        message: "Apply ${{ inputs.tool }} fixes"
+      id: commit_and_push
+      shell: bash
+      working-directory: ${{ inputs.working-directory }}
+      run: |
+        git config --global user.name "github-actions[bot]"
+        git config --global user.email "41898282+github-actions[bot]@users.noreply.github.com"
+        git add .
+        git commit -m "Apply ${{ inputs.tool }} fixes"
+        COMMIT_SHA=$(git rev-parse HEAD)
+        echo "commit_sha=$COMMIT_SHA" >> $GITHUB_OUTPUT
+        for i in {1..5}; do
+          if git push origin HEAD:${{ inputs.pr-info-ref }}; then
+            echo "Push successful on attempt $i."
+            echo "pushed=true" >> $GITHUB_OUTPUT
+            exit 0
+          fi
+          echo "Push failed on attempt $i. Waiting before retry..."
+          sleep $((5 * i))
+          echo "Fetching and rebasing..."
+          git fetch origin
+          if ! git rebase origin/${{ inputs.pr-info-ref }}; then
+            echo "::error::Automatic rebase failed. Please resolve conflicts manually."
+            exit 1
+          fi
+        done
+        echo "::error::Failed to push changes after multiple retries."
+        exit 1
 
     - name: Notify of commit
-      if: steps.add_and_commit.conclusion == 'success' && steps.add_and_commit.outputs.committed == 'true' && steps.add_and_commit.outputs.pushed == 'true'
+      if: steps.commit_and_push.conclusion == 'success' && steps.commit_and_push.outputs.pushed == 'true'
       uses: thollander/actions-comment-pull-request@24bffb9b452ba05a4f3f77933840a6a841d1b32b # v3.0.1
       with:
         message: |
-          Automatic ${{ inputs.tool }} fixes pushed (commit ${{ steps.add_and_commit.outputs.commit_sha }}).
+          Automatic ${{ inputs.tool }} fixes pushed (commit ${{ steps.commit_and_push.outputs.commit_sha }}).
           ⚠️ **Note:** Some issues may require manual review and fixing.
 
     - name: Create patch