Update add-license-header.yml (#39)

.github/workflows/add-license-header.yml

@@ -15,12 +15,21 @@ jobs:
     permissions:
       contents: write
       pull-requests: write
+      issues: write  # If you need to add labels or comments
 
     steps:
+    - name: Generate GitHub App Token
+      id: generate_token
+      uses: tibdex/github-app-token@v1
+      with:
+        app_id: ${{ vars.GH_APP_ID }}
+        private_key: ${{ secrets.GH_APP_PRIVATE_KEY }}
+
     - name: Checkout code
       uses: actions/checkout@v3
       with:
-        fetch-depth: 0  # Important for creating branches and PRs
+        fetch-depth: 0
+        token: ${{ steps.generate_token.outputs.token }}
 
     - name: Install Python (for running script)
       uses: actions/setup-python@v2
@@ -61,7 +70,7 @@ jobs:
       if: steps.changes.outputs.changes == 'true'
       uses: peter-evans/create-pull-request@v4
       with:
-        token: ${{ secrets.GITHUB_TOKEN }}
+        token: ${{ steps.generate_token.outputs.token }}
         commit-message: "Update license header in source files"
         branch: license-header-updates
         title: "Update License Headers"