[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3949: Remove the Ubuntu builders from GitHub Actions

[Tahoe-LAFS]

#3949: Remove the Ubuntu builders from GitHub Actions
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 Reporter:  exarkun  |          Owner:
     Type:  task     |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  n/a
 Keywords:           |  Launchpad Bug:
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 We've got Ubuntu on CircleCI which seems to be a bit more reliable.

 The GitHub Actions builders report their results more inconveniently:

 * You cannot see all of the logs while jobs are still running
 * There are no stable links to raw log files
 * The interface for navigating the log review is awkward web2 nonsense

 The GitHub Actions runners are less reliable:

 * They periodically don't bother to run at all
 * They sometimes crash halfway through a test run
 * They often exhibit nonsensical behavior like failing to clone the source
 repository
 * They are currently configured as VMs using VM images that are only
 available for Azure so it is impossible to replicate the environment
 locally (they could be configured as Docker image instead - but they're
 not)

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3949>
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