Fix survey-on-merged-pr.yml

This workflow still doesn't work. This time I try to fix id by adding permissions to the job

.github/workflows/survey-on-merged-pr.yml

@@ -4,9 +4,17 @@ on:
   pull_request:
     types: [closed]
 
+env:
+  PR_NUM: ${{ github.event.issue.number }}
+  SURVEY_URL: https://forms.gle/WV58koUBGSG9HBY66
+
 jobs:
   comment-on-pr:
+    name: Add survey to PR if author is not a member
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
     if: github.event.pull_request.merged == true
     steps:
       - name: Check if user is a member of the org
@@ -26,7 +34,6 @@ jobs:
       - name: Add comment to PR if author is not a member
         if: env.MEMBER_FOUND == 'false'
         run: |
-          PR_NUMBER=${{ github.event.pull_request.number }}
-          gh pr comment $PR_NUMBER --body "Thank you for your contribution! 🎉 We would like to hear from you about your experience contributing to OpenTelemetry by filling out this survey: https://forms.gle/WV58koUBGSG9HBY66"
+          gh pr comment ${PR_NUM} --body "Thank you for your contribution! 🎉 We would like to hear from you about your experience contributing to OpenTelemetry by filling out this survey: ${SURVEY_URL}"
         env:
           GH_TOKEN: ${{ secrets.OPENTELEMETRYBOT_GITHUB_TOKEN }}