Add pull_request for next build

We don't have any tests at all at the moment :grimace:
But at least we can make sure PRs don't totally break the build...

.github/workflows/nextjs.yml

@@ -11,6 +11,7 @@ on:
 
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
+  pull_request:
 
 # Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
 permissions:
@@ -115,6 +116,8 @@ jobs:
       url: ${{ steps.deployment.outputs.page_url }}
     runs-on: ubuntu-latest
     needs: build
+    # Don't deploy PRs, just test the build...
+    if: github.event_name != "pull_request"
     steps:
       - name: Deploy to GitHub Pages
         id: deployment