Update GitHub Actions workflows. (#24)

This PR was automatically generated by the
update-native-provider-workflows workflow in the pulumi/ci-mgmt repo,
from commit e8b9d89f27ba4e3a59389258853fbfd225f08c5a.

.github/workflows/build.yml

@@ -99,6 +99,8 @@ jobs:
         schema-tools compare -p ${{ env.PROVIDER }} -o ${{ github.event.repository.default_branch }} -n --local-path=provider/cmd/pulumi-resource-${{ env.PROVIDER }}/schema.json >> $GITHUB_ENV
 
         echo 'EOF' >> $GITHUB_ENV
+      env:
+        GITHUB_TOKEN: ${{ secrets.PULUMI_BOT_TOKEN }}
     - if: github.event_name == 'pull_request'
       name: Comment on PR with Details of Schema Check
       uses: thollander/actions-comment-pull-request@v2