Set permissions on the job level

We're getting a permissions error when running the deploy job:

> Ensure GITHUB_TOKEN has permission "id-token: write".

This is an attempt at fixing this.

Author: koppen

.github/workflows/parklife.yml

@@ -52,6 +52,12 @@ jobs:
     concurrency:
       group: deploy
       cancel-in-progress: true
+
+    # Grant GITHUB_TOKEN the permissions required to make a Pages deployment
+    permissions:
+      pages: write # to deploy to Pages
+      id-token: write # to verify the deployment originates from an appropriate source
+
     steps:
     - name: Deploy to GitHub Pages
       id: deployment