add kerberos authentication for tests

Maciej Pawel Szymanskirequested to merge
maszyman-krb-auth into master

This MR adds krb_auth argument to singularity_run and passes it in test() function.

I realised that we need kerberos token while running tests for LHCb.

See also https://gitlab.cern.ch/lhcb-core/nightly-builds/lb-nightly-deployment/-/merge_requests/41.

Edited by Maciej Pawel Szymanski

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