ci: add a simple cmake build test

We still support only meson. But to avoid super easy regressions such as
the previous commit, we add a very basic cmake build test. We don't care
about the compiler all we want is to avoid super simple breakage.

Signed-off-by: Patrick Bruenn <[email protected]>

.gitlab-ci.yml

@@ -65,6 +65,22 @@ build-alpine:
   before_script:
     - apk add g++ meson
 
+build-cmake:
+  stage: build
+  tags:
+    - docker
+  script:
+    - cmake -S . -B build
+    - cmake --build build
+    - cmake -S ./example -B example/build
+    - cmake --build example/build
+  artifacts:
+    when: always
+    paths:
+    - AdsLib/**/*.h
+    - build/
+    - example/build/
+
 build-linux-clang:
   extends: .build-meson-docker
   variables: