Update .gitlab-ci.yml - add tag for centos as well as debain

.gitlab-ci.yml

-# This file is a template, and might need editing before it works on your project.
-# use the official gcc image, based on debian
-# can use verions as well, like gcc:5.2
-# see https://hub.docker.com/_/gcc/
 image: gcc
 
-build:
+# run builds on ubuntu
+build-debain:
   stage: build
-  # instead of calling g++ directly you can also use some build toolkit like make
-  # install the necessary build tools when needed
   before_script:
     - apt update && apt -y install python3 python3-pip python3-setuptools python3-wheel ninja-build
     - pip3 install meson
@@ -21,6 +16,24 @@ build:
       # cache:
       #   paths:
       #     - "*.o"
+     
+     
+build-centos:
+  image: centos:8
+  stage: build
+  before_script:
+    - dnf update && dnf -y install python3 python3-pip python3-setuptools python3-wheel ninja-build build-essential
+    - pip3 install meson
+    - apt -y install libglfw3-dev libglew-dev
+  script:
+    - meson build
+  #artifacts:
+  #  paths:
+     # - mybinary
+      # depending on your build setup it's most likely a good idea to cache outputs to reduce the build time
+      # cache:
+      #   paths:
+      #     - "*.o"
 
 # run tests using the binary built before
 test: