CI: Check html links for doc

Author: hdiethelm

.github/workflows/ci.yml

@@ -183,6 +183,15 @@ jobs:
       run: |
         set -x
         tar -czf linuxcnc-doc.tar.gz -C docs/build html
+    - name: Check HTML Links
+      continue-on-error: true
+      run: |
+        #Note: -s disables remote link checks. This takes quite a long time but
+        #it should be done locally from time to time.
+        #Run after creating tar, so it can not change anything in the artifact
+        docker run -v $(pwd)/docs/build/html:/test --rm docker.io/wjdp/htmltest -s .
+        #remove tmp folder from htmltest
+        rm -r docs/build/html/tmp
     - name: Upload linuxcnc-doc artifact
       uses: actions/upload-artifact@v7
       with: