feat(ci): Build documentation

Signed-off-by: Rahix <rahix@rahix.de>

.gitlab-ci.yml

@@ -11,3 +11,23 @@ build:
     script:
         - ./bootstrap.sh
         - ninja -C build/
+
+pages:
+    stage: deploy
+    image: ubuntu:bionic
+    before_script:
+        - apt update -qq
+        - apt install -y -qq python3-pip git clang libclang-dev llvm
+        - pip3 install sphinx sphinx_rtd_theme clang
+        - git clone https://github.com/jnikula/hawkmoth.git
+        - (cd hawkmoth; python3 setup.py install)
+    script:
+        - export LD_LIBRARY_PATH=$(llvm-config --libdir)
+        - echo $LD_LIBRARY_PATH
+        - sphinx-build -b html Documentation/ Documentation/output/
+        - mv Documentation/output/ public/
+    artifacts:
+        paths:
+            - public/
+    only:
+        - master