hotfix: add gpu label on PR without merging

Signed-off-by: Akash Jaiswal <akashjaiswal3846@gmail.com>

Author: jaiakash

.github/workflows/request-gpu-runner-label.yaml

@@ -6,18 +6,26 @@ permissions:
   contents: read
 
 on:
+  pull_request:
+    types:
+      - opened
+      - reopened
+      - labeled
+      - synchronize
   pull_request_target:
     types:
       - labeled
       - synchronize
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.event.number }}
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number }}
   cancel-in-progress: true
 
 jobs:
   comment-if-missing-label:
+    if: github.event_name == 'pull_request' || (github.event_name == 'pull_request_target' && github.actor != 'github-actions[bot]')
     runs-on: ubuntu-latest
+
     steps:
       - name: Checkout PR branch
         uses: actions/checkout@v4
@@ -32,7 +40,7 @@ jobs:
           git fetch origin ${{ github.event.pull_request.head.sha }} --depth=1
 
           if git diff --name-only ${{ github.event.pull_request.base.sha }} ${{ github.event.pull_request.head.sha }} \
-            | grep -E '^examples/(deepspeed|torchtune)/'; then
+            | grep -E '^examples/(deepspeed|torchtune)/' >/dev/null; then
             echo "found_changes=true" >> $GITHUB_OUTPUT
           else
             echo "found_changes=false" >> $GITHUB_OUTPUT
@@ -51,8 +59,24 @@ jobs:
             const hasLabel = labels.some(l => l.name === 'ok-to-test-gpu-runner');
             core.setOutput('has_label', hasLabel ? 'true' : 'false');
 
+      - name: Check if comment already exists
+        id: comment-exists
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const { data: comments } = await github.rest.issues.listComments({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number
+            });
+            const botCommentExists = comments.some(c =>
+              c.user.type === 'Bot' &&
+              c.body.includes('ok-to-test-gpu-runner')
+            );
+            core.setOutput('exists', botCommentExists ? 'true' : 'false');
+
       - name: Post comment requesting label
-        if: steps.changes.outputs.found_changes == 'true' && steps.label-check.outputs.has_label == 'false'
+        if: steps.changes.outputs.found_changes == 'true' && steps.label-check.outputs.has_label == 'false' && steps.comment-exists.outputs.exists == 'false'
         uses: actions/github-script@v7
         with:
           script: |
@@ -63,4 +87,4 @@ jobs:
               body: `Hello @andreyvelich @varodrig @jaiakash 👋,
               Changes were detected in the LLM blueprint directories (\`examples/deepspeed\` or \`examples/torchtune\`).
               To run the test on GPU infra, please add the **ok-to-test-gpu-runner** label to this PR.`
-                          });
+            });