include lychee to check for broken links

.github/workflows/hugo.yaml

@@ -42,9 +42,32 @@ jobs:
         run: hugo
 
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
+          name: public
           path: ./public
+          include-hidden-files: true
+          retention-days: 1
+
+  # Checking links using lychee
+  linkchecker:
+    runs-on: ubuntu-22.04
+    needs: build
+    steps:
+      - name: Download artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: public
+          path: .
+
+      - name: Link Checker
+        id: lychee
+        uses: lycheeverse/lychee-action@v1
+        with:
+          args: '-r 5 -u "Mozilla/5.0 (Windows NT 10.0; Win64; x64) Apple WebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36" --exclude sncf.com --exclude nge.flatland.cloud --max-concurrency 1 .'
+          # Fail on errors
+          fail: false
+          # TODO: Implement https://github.com/lycheeverse/lychee/issues/989 once it's done. Will help with LinkedIn rate limits
 
   # Deployment job
   deploy:
@@ -56,6 +79,17 @@ jobs:
     # Only deploy if on main branch
     if: github.ref == 'refs/heads/main'
     steps:
+      - name: Download artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: public
+          path: ./public
+
+      - name: Upload pages artifact
+        uses: actions/upload-pages-artifact@v2
+        with:
+          path: ./public
+
       - name: Deploy to GitHub Pages
         id: deployment
         uses: actions/deploy-pages@v2

.gitignore

@@ -16,4 +16,7 @@ hugo.linux
 # Temporary lock file while building
 /.hugo_build.lock
 
+# lychee
+.lycheecache
+
 # End of https://www.toptal.com/developers/gitignore/api/hugo