chore: Replace personal access token with GitHub App Token (#13)

Author: Reikyo

.github/workflows/create-data-model-pr.yaml

@@ -48,12 +48,19 @@ jobs:
         run: if [ "$(git diff --numstat | grep -vc '^.*package\.json\|.*package-lock\.json$')" -eq "0" ]; then git stash; else echo "Material changes found"; fi
         working-directory: ./
 
+      - name: Generate GitHub App Token
+        uses: actions/create-github-app-token@v1
+        id: generate-token
+        with:
+          app-id: ${{ secrets.GH_APP_ID }}
+          private-key: ${{ secrets.GH_APP_PRIVATE_KEY }}
+
       - name: Create Pull Request
         id: cpr
         uses: peter-evans/create-pull-request@v4
         with:
           path: .
-          token: ${{ secrets.PUBLIC_REPO_ACCESS_TOKEN }}
+          token: ${{ steps.generate-token.outputs.token }}
           commit-message: Update data models and dataset site template
           committer: openactive-bot <openactive-bot@users.noreply.github.com>
           author: openactive-bot <openactive-bot@users.noreply.github.com>