update trigger condition

.github/workflows/pr_approval.yml

@@ -5,18 +5,12 @@ name: Check PR Approvals
 # To protect against that scenario, we can turn on number of approvals required to 2 in the github settings
 # of the repository
 on:
- pull_request_review:
- types: [submitted]
  workflow_dispatch:
-
-# Without these permissions, we get a 403 error from github
-# for trying to modify the pull request for newer project.
-# Source: https://stackoverflow.com/a/76994510
-permissions: write-all
+ pull_request:
+ branches: [ main ]
 
 jobs:
  check-approvals:
- if: github.event.review.state == 'APPROVED' || github.event_name == 'workflow_dispatch'
  runs-on: ubuntu-latest
  steps:
  - name: Checkout repository