ci: Add a static analysis job

Use the Clang static analysis tool.

For the time being, we're going to allow it to fail, but the plan is to
fix every issue it raises.

.gitlab-ci.yml

@@ -1,5 +1,6 @@
 stages:
   - build
+  - analysis
   - docs
   - flatpak
   - deploy
@@ -166,13 +167,26 @@ flatpak-master:icon-browser:
     APPID: org.gtk.IconBrowser4
   <<: *flatpak-master
 
+static-scan:
+  image: registry.gitlab.gnome.org/gnome/gtk/fedora:v14
+  stage: analysis
+  variables:
+    EXTRA_MESON_FLAGS: "--buildtype=debug"
+  script:
+    - meson ${COMMON_MESON_FLAGS} ${EXTRA_MESON_FLAGS} _scan_build
+    - ninja -C _scan_build scan-build
+  artifacts:
+    paths:
+      - _scan_build/meson-logs
+  allow_failure: true
+
 reference:
   image: registry.gitlab.gnome.org/gnome/gtk/fedora:v14
   stage: docs
   variables:
     EXTRA_MESON_FLAGS: "--buildtype=release"
   script:
-    - meson ${COMMON_MESON_FLAGS} -Dgtk_doc=true _build
+    - meson ${COMMON_MESON_FLAGS} ${EXTRA_MESON_FLAGS} -Dgtk_doc=true _build
     - ninja -C _build gdk4-doc gsk4-doc gtk4-doc
     - mkdir -p _reference/
     - mv _build/docs/reference/gdk/html/ _reference/gdk/