Defined some global variables into CI/CD Variables so that a change in them does not result in new commits

fixes to nest package according to @emueller changes in test_brainscales branch (revision required by @terhorst)

Fix typo

See merge request akarmas/ebrains-spack-builds!4

Update NEST package.py

See merge request akarmas/ebrains-spack-builds!3

Update to NEST 3.0

See merge request akarmas/ebrains-spack-builds!2

Update of NEST package

See merge request akarmas/ebrains-spack-builds!1

Final touches. Not using anymore SWIFT as intermediate, copying files directly from gitlab runner to the OpenShift job pod

Code cleanup and final touches for sending spack yaml files and packages to the Openshift build job through the Gitlab runner instead of using SWIFT as the intermediate

Propagate the logs of the OpenShift build job to the Gitlab runner so that pipeline watchers can see the build job logs