Add explicit GITHUB_TOKEN permissions to PR workflow

Co-authored-by: DennisAlund <2051607+DennisAlund@users.noreply.github.com>

Author: Copilot

.github/workflows/pr_build_example.yml

@@ -8,6 +8,8 @@ jobs:
     name: Android example build (debug)
     runs-on: ubuntu-latest
     timeout-minutes: 45
+    permissions:
+      contents: read
     env:
       CI: true
       GRADLE_OPTS: -Dorg.gradle.daemon=false -Dorg.gradle.vfs.watch=false