Run workflow on PR merge

Author: flacial

.github/workflows/init-preview-db.yml

@@ -8,6 +8,7 @@ on:
 
 jobs:
   ssh-and-update-preview-db:
+    if: github.event.pull_request.merged == true
     runs-on: ubuntu-latest
     steps:
       - uses: appleboy/ssh-action@master