[tbb-bugs] #24912 [Applications/Tor Browser]: Prepare tor-browser-build for building stable releases

[Tor Bug Tracker & Wiki]

#24912: Prepare tor-browser-build for building stable releases
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     Reporter:  gk                        |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  High                      |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
                                          |  TorBrowserTeam201801
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 Up to now we used `tor-browser-build` to only build alpha and nightly
 bundles but we think it is mature enough to fully replace Gitian.

 This bug tracks the changes we need to make to be able to build stable,
 alpha, and nightly bundles from the same branch.

 If we think that gets too messy we move back to make dedicated `maint-XX`
 branches. We'd like to avoid that, though, as it has been confusing in the
 past for users that wanted to build Tor Browser.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24912>
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