chore(gh-action): build eleventy sur push et pr toutes les branches, …

…mais gh-pages uniquement push sur main

.github/workflows/11ty.yml → .github/workflows/build-gh-pages.yml

@@ -1,10 +1,10 @@
 # Sample workflow for building and deploying an Eleventy site to GitHub Pages
-name: Deploy Eleventy with GitHub Pages dependencies preinstalled
+name: Build & Deploy Eleventy with GitHub Pages dependencies preinstalled
 
 on:
     # Runs on pushes targeting the default branch
     push:
-        branches: ["main"]
+    pull_request:
 
     # Allows you to run this workflow manually from the Actions tab
     workflow_dispatch:
@@ -45,6 +45,7 @@ jobs:
 
     deploy-ghpages:
         name: Deploy to github pages
+        if: github.event_name == 'push' && github.ref_name == 'main'
         environment:
             name: github-pages
             url: ${{ steps.deployment.outputs.page_url }}