attempt to fix building process on gitlab #9

.gitlab-ci.yml

@@ -1,4 +1,4 @@
-image: docker pull thewtex/opengl:latest
+image: docker pull rikorose/gcc-cmake:gcc-8
 
 stages:
   - build
@@ -6,5 +6,6 @@ stages:
 build:
   stage: build
   script:
+    - apt update && apt install libmesa-dev && apt-file update && apt-file search "gl.h"
     - gcc --version
     - mkdir -p build && cd build && cmake -DCMAKE_BUILD_TYPE=Release .. && make -j