Add permissions

.github/workflows/schema-validation.yml

@@ -9,6 +9,22 @@ jobs:
   validate-gtfs:
     if: github.repository_owner == 'opentripplanner'
     name: Validate GraphQL schema changes
+    permissions:
+      actions: write
+      attestations: write
+      checks: write
+      contents: write
+      deployments: write
+      id-token: write
+      issues: write
+      discussions: write
+      packages: write
+      pages: write
+      pull-requests: write
+      repository-projects: write
+      security-events: write
+      statuses: write
+
     runs-on: ubuntu-latest
 
     steps: