ci: ensure build job runs on pushes to master as well

.github/workflows/hugo.yaml

@@ -2,11 +2,7 @@
 name: Deploy Hugo site to Pages
 
 on:
-  # Runs on pushes targeting the default branch
   push:
-    branches:
-      - prod 
-
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
 
@@ -72,6 +68,7 @@ jobs:
       url: ${{ steps.deployment.outputs.page_url }}
     runs-on: ubuntu-latest
     needs: build
+    if: github.ref == 'refs/heads/prod'
     steps:
       - name: Deploy to GitHub Pages
         id: deployment