[tbb-bugs] #32805 [Applications/Tor Browser]: Make creation of downloads.json optional

[Tor Bug Tracker & Wiki]

#32805: Make creation of downloads.json optional
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     Reporter:  boklm                |      Owner:  boklm
         Type:  task                 |     Status:  assigned
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  tbb-rbm, tbb-update,
     Severity:  Normal               |  TorBrowserTeam201912
Actual Points:  .1                   |  Parent ID:  #25102
       Points:                       |   Reviewer:
      Sponsor:                       |
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 In `tools/update-responses/update_responses` we generate a
 `downloads.json` file containing the list of bundles available for
 download. However we don't need to create that file for nightly builds,
 and only have the .mar files available when running this script for the
 nightly updates. So we should add an option to make creation of
 `downloads.json` optional.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32805>
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