Update .gitlab-ci.yml file

2 jobs for master in 19 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
failed #422502
centos7

00:00:05

passed #422501
ubuntu20.04

00:00:19

 
Name Stage Failure
failed
centos7 Build
$ export PATH=$ROOTSYS/bin/:$PATH
$ export LD_LIBRARY_PATH=$ROOTSYS/lib/:$LD_LIBRARY_PATH
$ mkdir -p build
$ mkdir -p install
$ cd build
$ cmake -DCMAKE_INSTALL_PREFIX=../install ../sources/
/usr/bin/bash: line 131: cmake: command not found
Cleaning up file based variables
ERROR: Job failed: exit code 1