[tor-bugs] #22891 [Core Tor/Tor]: Add GitLab CI configs

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#22891: Add GitLab CI configs
-------------------------------------------------+-------------------------
 Reporter:  catalyst                             |          Owner:  hiro
     Type:  defect                               |         Status:
                                                 |  needs_revision
 Priority:  High                                 |      Milestone:  Tor:
                                                 |  0.3.2.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  ci, continuous-integration,          |  Actual Points:
  testing, best-practice, unit-testing, new-     |
  developers, review-group-22, review-group-23   |
Parent ID:                                       |         Points:
 Reviewer:  ahf, dgoulet                         |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by hiro):

 * status:  needs_review => needs_revision


Comment:

 The DEPLOY_KEY variable is just a name of a ssh key that is authorised to
 push to oniongit master. That key has to be stored in oniongit and can be
 changed by a master or owner of the repository. You can check:
 https://gitlab.dep.state.fl.us/help/ssh/README.md#deploy-keys for more
 info.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22891#comment:22>
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