add a simple github action workflow to build test the documentation

Signed-off-by: Matthieu Gallien <matthieu.gallien@nextcloud.com>

.drone.yml

@@ -189,23 +189,7 @@ trigger:
     - pull_request
     - push
 ---
-kind: pipeline
-name: Documentation
-
-steps:
-- name: build
-  image: nextcloudci/documentation:documentation-5
-  commands:
-    - cd doc
-    - make html
-trigger:
-  branch:
-    - master
-  event:
-    - pull_request
-    - push
----
 kind: signature
-hmac: 1fbd0241ba0d4ea2702804324f4932b3f29d3d937ef75906a529cd00c4252a57
+hmac: 94f252484ad174569755f01f37a1776a74085e73b39e36defd4c9e5e13b48456
 
 ...

.github/workflows/documentation.yml

@@ -0,0 +1,22 @@
+name: Generate Documentation
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+jobs:
+  build:
+    name: Generate Documentation
+    runs-on: ubuntu-latest
+    container: ghcr.io/nextcloud/continuous-integration-client-qt6-doc:client-doc-6.8.0-1
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+      - name: Generate documentation
+        run: |
+          cd doc
+          make html > build.log 2>&1
+          if grep WARNING build.log; then
+              exit 1
+          else
+              exit 0
+          fi