Update .gitlab-ci.yml

2 jobs for master in 7 seconds
Name Stage Failure
job1 Build
zlib1g is already the newest version (1:1.2.11.dfsg-2ubuntu1).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
$ apt-get -y install CMake
Reading package lists...
Building dependency tree...
Reading state information...
E: Unable to locate package CMake
Cleaning up file based variables
ERROR: Job failed: exit code 1