Run unit tests on pull requests targeting master.

Keep deploy limited to pushes on master so PR CI validates changes without deploying.

.gitea/workflows/deploy.yml

@@ -3,6 +3,8 @@ name: Deploy Company Site
 on:
   push:
     branches: [master]
+  pull_request:
+    branches: [master]
 
 jobs:
   test:
@@ -24,6 +26,7 @@ jobs:
 
   deploy:
     needs: test
+    if: gitea.event_name == 'push' && gitea.ref == 'refs/heads/master'
     runs-on: self-hosted
     steps:
       - name: Checkout