Check whether everything has documentation on build

.drone.yml

@@ -28,11 +28,6 @@ steps:
       - cd build-debug
       - ./ArbutilsTests -s --durations yes --use-colour yes
       - valgrind --tool=memcheck --gen-suppressions=all --leak-check=full --leak-resolution=med --track-origins=yes --vgdb=no --error-exitcode=1 ./ArbutilsTests exclude:"Throw exception get stack trace"
-  - name: style-check
-    image: deukhoofd/linux64builder
-    failure: ignore
-    commands:
-      - run-clang-format.py -r src/ tests/ --exclude "*MacroUtils.hpp"
   - name: test-release-windows
     image: deukhoofd/windowsbuilder
     commands:
@@ -44,6 +39,16 @@ steps:
       - cmake --build build-release-windows --target all -- -j  4
       - export WINEARCH=win64
       - wine build-release-windows/ArbutilsTests.exe -s exclude:"Throw exception get stack trace"
+  - name: style-check
+    image: deukhoofd/linux64builder
+    failure: ignore
+    commands:
+      - run-clang-format.py -r src/ tests/ --exclude "*MacroUtils.hpp"
+  - name: documentation-check
+    image: deukhoofd/linux64builder
+    commands:
+      - ( cat Doxyfile ; echo "WARN_AS_ERROR=YES" ) | doxygen -
+      - rm -rf docs
   - name: conan-deploy
     image: deukhoofd/linux64builder
     environment: