[FEATURE] Add the ability to listen on UNIX sockets

[jackyzy823]

Describe the feature you'd like to see added
it would be very helpful that whoogle supports listening on UNIX sockets.

Additional context

waitress supports unix_socket. link

However it may conflict with listen link

Thanks.

[jackyzy823]

Besides.

environment HTTPS_ONLY do not work since it is shadowed by args.https_only ,

whoogle-search/app/routes.py

Line 430 in c41e0fc

os.environ['HTTPS_ONLY'] = '1' if args.https_only else ''

[PrivacyDevel]

The permissions of the Unix socket seem to be too restrictive. Only the owner of the socket is able to connect to it, which prevents a reverse proxy from being able to connect to it if the reverse proxy is run as a different user. Which should pretty much always be the case.

[master-hax]

@PrivacyDevel i have put up a fix for the issue in #1103