[tbb-bugs] #32498 [Applications/Tor Browser]: Consider updating MAR_CHANNEL_ID for nightly build (and maybe alpha too)

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#32498: Consider updating MAR_CHANNEL_ID for nightly build (and maybe alpha too)
-------------------------------------+-------------------------------------
     Reporter:  boklm                |      Owner:  tbb-team
         Type:  task                 |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  tbb-rbm, boklm201911,
     Severity:  Normal               |  tbb-update, TorBrowserTeam201911
Actual Points:                       |  Parent ID:  #18867
       Points:                       |   Reviewer:
      Sponsor:                       |
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 In `browser/confvars.sh` (from `tor-browser.git`) we currently set
 `MAR_CHANNEL_ID` to `torbrowser-torproject-release` in all cases.

 I see that Mozilla is using a different `MAR_CHANNEL_ID` for each of their
 channel (previously by updating `browser/confvars.sh`, and now by setting
 it from taskcluster: https://hg.mozilla.org/releases/mozilla-
 release/rev/66f52bda7e14e26235bd0a43bb68ad11775046e4).

 So I am wondering if we should do the same, and use a different
 `MAR_CHANNEL_ID` for nightly, and maybe for the alpha too.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32498>
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