[tor-bugs] #21490 [Internal Services/Service - jenkins]: Add builders for maint-0.3.0 branch

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#21490: Add builders for maint-0.3.0 branch
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     Reporter:  nickm                                |      Owner:  weasel
         Type:  task                                 |     Status:  new
     Priority:  Medium                               |  Milestone:
    Component:  Internal Services/Service - jenkins  |    Version:
     Severity:  Normal                               |   Keywords:
Actual Points:                                       |  Parent ID:
       Points:                                       |   Reviewer:
      Sponsor:                                       |
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 0.3.0 has now been forked off from the master branch onto a maint-0.3.0
 and release-0.3.0 branch, per the usual protocol.  It hasn't diverged much
 yet, but it's only a matter of time.

 So, we should probably have maint-0.3.0 builders.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21490>
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