Fix script

.github/workflows/prettier.yml

@@ -11,15 +11,21 @@ on:
 
 jobs:
   format:
+    if: github.repository != 'RocketChat/Rocket.Chat.ReactNative'
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+      issues: write
 
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
         with:
-          ref: ${{ github.head_ref || github.ref_name }}
+          ref: ${{ github.event.pull_request.head.ref }}
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
           fetch-depth: 0
-
+          
       - name: Set up Node.js
         uses: actions/setup-node@v2
         with: