ci: use app's token

Signed-off-by: smallkirby <[email protected]>

.github/workflows/cherry-pick-bot.yml

@@ -11,6 +11,13 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
+      - name: Generate a token
+        id: generate-token
+        uses: actions/create-github-app-token@v1
+        with:
+          app_id: ${{ vars.APP_ID }}
+          private_key: ${{ secrets.APP_PRIVATE_KEY }}
+
       - name: Setup uv
         uses: astral-sh/setup-uv@v5
 
@@ -27,7 +34,7 @@ jobs:
 
       - name: Run Cherry Pick Script
         env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ steps.generate-token.outputs.token }}
           PR_NUMBER: ${{ github.event.issue.number }}
           REPO: ${{ github.repository }}
         run: uv run .github/scripts/cherry-picker.py