[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3731: Make `tox -e news` work on macOS

[Tahoe-LAFS]

#3731: Make `tox -e news` work on macOS
---------------------+---------------------------
 Reporter:  sajith   |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  n/a
 Keywords:           |  Launchpad Bug:
---------------------+---------------------------
 On macOS, `tox -e news` fails with this message:

 {{{
 WARNING: test command found but not installed in testenv
   cmd: /usr/local/bin/git
   env: /Users/sajith/tahoe-lafs/.tox/news
 Maybe you forgot to specify a dependency? See also the allowlist_externals
 envconfig setting.

 DEPRECATION WARNING: this will be an error in tox 4 and above!
 Author identity unknown

 *** Please tell me who you are.

 Run

   git config --global user.email "you at example.com"
   git config --global user.name "Your Name"

 to set your account's default identity.
 Omit --global to set the identity only in this repository.

 fatal: unable to auto-detect email address (got 'sajith at mac.(none)')
 ERROR: InvocationError for command /usr/local/bin/git commit -m 'update
 NEWS.txt for release' (exited with code 128)
 }}}

 I do have `user.name` and `user.email` set in `~/.gitconfig`. Looks like
 Towncrier needs `$HOME` in Tox `news` environment.

--
Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3731>
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