Update diff_comment.yml

.github/workflows/diff_comment.yml

@@ -8,22 +8,26 @@ on:
 jobs:
   comment:
     runs-on: ubuntu-latest
-    if: github.event.workflow_run.jobs['diff'].steps.upload-log.outputs.artifact_id == needs.diff_artifact.outputs.artifact_id
+    if: github.event.workflow_run.outputs.diff_generated
     permissions:
       issues: write
     steps:
+      - name: Get the PR number
+        id: get_pr_number
+        run: |
+          echo "pr_number=$(jq '.workflow_run.pull_requests[0].number' $GITHUB_EVENT_PATH)" >> $GITHUB_OUTPUT
       - name: Download diff
-        id: diff_artifact
         uses: actions/download-artifact@v4
         with:
           name: openapi-diff-log
+          workflow: 'Lint and validate OpenAPI specs'
       - name: Create PR comment
         uses: actions/github-script@v7
         with:
           script: |
             const diff = require('fs').readFileSync('diff.md', 'utf8');
             github.rest.issues.createComment({
-              issue_number: github.event.workflow_run.pull_requests[0].number, 
+              issue_number: steps.get_pr_number.outputs.pr_number,
               owner: context.repo.owner,
               repo: context.repo.repo,
               body: '## OpenAPI diff:\n\n' + diff