gitlab: add a trivial gitlab CI configuration

.gitlab-ci.yml

@@ -0,0 +1,17 @@
+# Based on the GitLab example CI configuration
+
+# use the official gcc image, based on debian
+image: gcc
+
+build:
+  stage: build
+  before_script:
+    - apt update
+    - apt -y install cmake ninja
+  script: 
+    - cmake -G Ninja -DCMAKE_BUILD_TYPE=Release -DLTO=ON -DTESTS=ON
+
+test:
+  stage: test
+  script:
+    - ctest -vvv