[metrics-bugs] #33309 [Metrics/Cloud]: Add support for custom clone URL and branch selection for Onionperf

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#33309: Add support for custom clone URL and branch selection for Onionperf
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     Reporter:  acute          |      Owner:  metrics-team
         Type:  enhancement    |     Status:  new
     Priority:  Medium         |  Milestone:
    Component:  Metrics/Cloud  |    Version:
     Severity:  Normal         |   Keywords:
Actual Points:                 |  Parent ID:
       Points:                 |   Reviewer:
      Sponsor:                 |
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 To support OP experiments we should allow branches/tags and alternative
 URLs to be specified in variables when deploying Onionperf instances.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33309>
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