Merge pull request creativecommons#213 from creativecommons/build-site-on-PRs

Build site on PRs as well

Author: kgodey

.github/workflows/lektor-build-deploy.yml

@@ -1,5 +1,5 @@
 name: Build and Deploy CC Open Source
-on: [push]
+on: [push, pull_request]
 jobs:
  build-and-deploy:
   runs-on: ubuntu-latest