Update build_gt.yml to include id-token permissions

Add permissions for id-token in GitHub Actions workflow

Author: NicuS03

.github/workflows/build_gt.yml

@@ -18,6 +18,9 @@ env:
   APP_NAME: gt-${{ github.event.inputs.version }}
   DEB_SCRIPT_LOCATION: repo-scripts
 
+permissions: 
+  id-token: write
+
 jobs:
   build:
     runs-on: ubuntu-24.04-arm