Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -6,4 +6,5 @@ build-container:
     - apt install -y software-properties-common
     - add-apt-repository -y ppa:ubuntu-toolchain-r/test && apt update
     - apt install -y libswscale-dev libswresample-dev libpostproc-dev libavutil-dev libavresample-dev libavformat-dev libavfilter-extra libavfilter-dev libavdevice-dev libavcodec-extra libavcodec-dev ffmpeg git cmake libvulkan-dev gcc-10 gcc-10-base gcc-10-doc g++-10 libopenal-dev
-    - ls -lh
+    - mkdir build && cd build
+    - cmake -DCMAKE_C_COMPILER=/usr/bin/gcc-10 -DCMAKE_CXX_COMPILER=/usr/bin/g++-10 -DCMAKE_BUILD_TYPE=Debug .. && cmake --build . -j4