ci-fairy: Allow passing the token in a file to the login cmd
I'm assuming the work on this.
I opened this MR in favor of !112 (closed), since I can't update others MR.
The goal is the same, which is:
gitlab has sometimes trouble when masking the JWT token, so to avoid it leaking occasionally, allow passing it in a file.
Changes from !112 (closed):
- Rebased with
origin/master
- Fixed a minor issue with new unit test