[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3632: Build docs as a CI job

[Tahoe-LAFS]

#3632: Build docs as a CI job
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 Reporter:  sajith              |          Owner:  sajith
     Type:  defect              |         Status:  new
 Priority:  normal              |      Milestone:  undecided
Component:  dev-infrastructure  |        Version:  n/a
 Keywords:                      |  Launchpad Bug:
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 We currently do not run `tox -e docs` anywhere in our CI steps.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3632>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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