[gnome-shell/zbrown/docgen] ci: Build docs in CI

[Zander Brown <zbrown src gnome org>]

commit b06739a40ac2b40813cde9b3a5920941fba87d79
Author: Zander Brown <zbrown gnome org>
Date:   Mon Jun 7 01:10:28 2021 +0100

    ci: Build docs in CI

 .gitlab-ci.yml | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 78f380aa41..f6c25102b0 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -9,6 +9,7 @@ stages:
  - review
  - build
  - test
+ - docs
  - deploy
 
 default:
@@ -58,6 +59,9 @@ workflow:
             dnf install -y nodejs &&
             npm install -g eslint &&
 
+            # For docs
+            dnf install -y python3-markdown python3-toml python3-typogrify &&
+
             dnf group install -y 'Development Tools' \
                                  'C Development Tools and Libraries' &&
             dnf install -y meson &&
@@ -227,3 +231,31 @@ nightly:
   extends: '.publish_nightly'
   variables:
     BUNDLES: '$BUNDLE'
+
+reference:
+    stage: docs
+    needs: []
+    before_script:
+        - .gitlab-ci/checkout-mutter.sh
+        - meson mutter mutter/build --prefix=/usr -Dtests=false
+        - ninja -C mutter/build install
+    script:
+        - meson -Dman=false -Dgtk_doc=true build
+        - ninja -C build
+        - mkdir -p reference/
+        - mv build/docs/St/ reference/
+        - mv build/docs/Shell/ reference/
+    artifacts:
+        paths:
+            - reference
+
+pages:
+    stage: deploy
+    needs: ['reference']
+    script:
+        - mv reference/ public/
+    artifacts:
+        paths:
+             - public
+    only:
+        - master