[metrics-bugs] #31402 [Metrics/Website]: Add metrics-web's master branch to GitLab's CI

[Tor Bug Tracker & Wiki]

#31402: Add metrics-web'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/Website  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:  #31398
       Points:                   |   Reviewer:
      Sponsor:                   |
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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31402>
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