Run unit tests in gitlab CI for linux build

.gitlab-ci.yml

@@ -1,7 +1,7 @@
 stages:
   - build
 
-Debian:
+.Debian:
   tags:
     - docker
     - linux
@@ -14,20 +14,34 @@ Debian:
   before_script:
     - export APT_CACHE_DIR=`pwd`/apt-cache && mkdir -pv $APT_CACHE_DIR
     - apt-get update -yq 
-    - apt-get -o dir::cache::archives="$APT_CACHE_DIR" install -y cmake build-essential libboost-filesystem-dev libboost-program-options-dev libboost-system-dev libboost-iostreams-dev libavcodec-dev libavformat-dev libavutil-dev libswscale-dev libswresample-dev libsdl2-dev libqt5opengl5-dev libopenal-dev libopenscenegraph-dev libunshield-dev libtinyxml-dev libmygui-dev libbullet-dev ccache
+    - apt-get -o dir::cache::archives="$APT_CACHE_DIR" install -y cmake build-essential libboost-filesystem-dev libboost-program-options-dev libboost-system-dev libboost-iostreams-dev libavcodec-dev libavformat-dev libavutil-dev libswscale-dev libswresample-dev libsdl2-dev libqt5opengl5-dev libopenal-dev libopenscenegraph-dev libunshield-dev libtinyxml-dev libmygui-dev libbullet-dev ccache git
   stage: build
   script:
     - export CCACHE_BASEDIR="`pwd`"
     - export CCACHE_DIR="`pwd`/ccache" && mkdir -pv "$CCACHE_DIR"
-    - ccache -z -M 250M
+    - ccache -z -M 1G
-    - cores_to_use=$((`nproc`-2)); if (( $cores_to_use < 1 )); then cores_to_use=1; fi
+    - CI/before_script.linux.sh
-    - mkdir build; cd build; cmake -DCMAKE_BUILD_TYPE=MinSizeRel ../ -DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache
+    - cd build
-    - make -j$cores_to_use
+    - cmake --build . -- -j $(nproc)
-    - DESTDIR=artifacts make install
+    - cmake --install .
+    - if [[ "${BUILD_TESTS_ONLY}" ]]; then ./openmw_test_suite; fi
     - ccache -s
   artifacts:
     paths:
-      - build/artifacts/
+      - build/install/
+
+Debian_GCC:
+  extends: .Debian
+  variables:
+    CC: gcc
+    CXX: g++
+
+Debian_GCC_tests:
+  extends: .Debian
+  variables:
+    CC: gcc
+    CXX: g++
+    BUILD_TESTS_ONLY: 1
 
 MacOS:
   tags: