chore(IDX): replace token with app

Author: cgundy

.github/workflows/schedule-rc.yml

@@ -12,12 +12,18 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 30
     steps:
+      - name: Create GitHub App Token
+        uses: actions/create-github-app-token@v1
+        id: app-token
+        with:
+          app-id: ${{ vars.PUSH_TO_RC_BRANCH_PRIVATE_KEY }}
+          private-key: ${{ secrets.PUSH_TO_RC_BRANCH_APP_ID }}
       - name: Checkout
         uses: actions/checkout@v4
         with:
           repository: ${{ github.repository }}
           ref: ${{ github.ref }}
-          token: ${{ secrets.PUSH_TO_IC }}
+          token: ${{ steps.app-token.outputs.token }}
       - name: Cut Release Candidate
         shell: bash
         run: |