[generate_manifest] use GitHub app instead of token (#237)

Author: GabrielDrapor

.github/workflows/generate-manifest.yml

@@ -18,10 +18,17 @@ jobs:
       pull-requests: write
 
     steps:
+      - name: Generate GitHub App token
+        id: app-token
+        uses: actions/create-github-app-token@v1
+        with:
+          app-id: ${{ secrets.BOT_APP_ID }}
+          private-key: ${{ secrets.BOT_PRIVATE_KEY }}
+
       - name: Checkout repository
         uses: actions/checkout@v4
         with:
-          token: ${{ secrets.GITHUB_TOKEN }}
+          token: ${{ steps.app-token.outputs.token }}
 
       - name: Set up Python
         uses: actions/setup-python@v4
@@ -51,7 +58,7 @@ jobs:
       - name: Create Pull Request
         uses: peter-evans/create-pull-request@v5
         with:
-          token: ${{ secrets.GITHUB_TOKEN }}
+          token: ${{ steps.app-token.outputs.token }}
           commit-message: |
             feat: add manifest for ${{ steps.repo-info.outputs.repo_name }}