[metrics-bugs] #31399 [Metrics/CollecTor]: Add CollecTor's master branch to GitLab's CI

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#31399: Add CollecTor's master branch to GitLab's CI
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     Reporter:  karsten            |      Owner:  metrics-team
         Type:  enhancement        |     Status:  new
     Priority:  Medium             |  Milestone:
    Component:  Metrics/CollecTor  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:  #31398
       Points:                     |   Reviewer:
      Sponsor:                     |
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 Please add CollecTor's master branch to GitLab's CI.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31399>
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