SW-394: Add gitlab CI yaml file

.gitlab-ci.yml

+image: gcc
+
+before_script:
+ - apt-get update --yes
+ - apt-get install --yes cmake
+
+build:
+  script:
+    - mkdir -p build/gnucxx11_opt 
+    - cd build/gnucxx11_opt
+    - cmake -DBUILD_PACKAGES=TriggerServices ../.. 
+    - make
+
+