[tor-bugs] #33803 [Applications/Tor Browser]: Generate a second mar signing key for nightly

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#33803: Generate a second mar signing key for nightly
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     Reporter:  boklm                     |      Owner:  tbb-team
         Type:  task                      |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
                                          |  TorBrowserTeam202004
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 We currently have only one mar signing key accepted by the nightly builds.
 To plan for rotation of the key, we should generate a second one in
 advance (offline), and add it as
 `toolkit/mozapps/update/updater/nightly_aurora_level3_secondary.der`.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33803>
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