ci: add pull request workflow trigger for ready_for_review (#45)

Author: tien

.github/workflows/pull-request.yml

@@ -3,6 +3,9 @@ name: Pull request
 on:
   pull_request:
     branches: [main]
+    # Add trigger for `ready_for_review`
+    # https://github.com/changesets/action/issues/187
+    types: [opened, reopened, synchronize, ready_for_review]
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}