Update .gitlab-ci.yml

1 job for main in 9 seconds (queued for 3 seconds)
Name Stage Failure
run_pytest Test
Installing collected packages: numpy
Successfully installed numpy-1.21.4
WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv
WARNING: You are using pip version 21.2.4; however, version 21.3.1 is available.
You should consider upgrading via the '/usr/local/bin/python -m pip install --upgrade pip' command.
$ pytest testlabRLS.py
/bin/bash: line 119: pytest: command not found
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1