fix: authorize github action user to write content

Author: reshnm

.github/workflows/ci.lib.yaml

@@ -3,11 +3,22 @@ name: CI
 on:
   workflow_call:
 
+permissions:
+  contents: write # we need this to be able to push to the pull request
+
 jobs:
   build:
     runs-on: ubuntu-24.04
 
     steps:
+      - name: Create GitHub App token
+        uses: actions/create-github-app-token@df432ceedc7162793a195dd1713ff69aefc7379e # v2
+        id: app-token
+        with:
+          # required
+          app-id: 1312871
+          private-key: ${{ secrets.OPENMCP_CI_APP_PRIVATE_KEY }}
+          
       - name: Checkout code
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
         with: