[tor-bugs] #25102 [Applications/Tor Browser]: Add script to sign nightly build mar files

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#25102: Add script to sign nightly build mar files
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     Reporter:  boklm                     |      Owner:  tbb-team
         Type:  task                      |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  tbb-rbm
Actual Points:                            |  Parent ID:  #18867
       Points:                            |   Reviewer:
      Sponsor:                            |
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 We need a script that will fetch the latest nightly build from the build
 machine, then sign the mar files and publish them.

 Later we can improve it to fetch builds from multiple builders and only do
 the signing if they match.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25102>
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