Disable IPv6 for sharelatex container

[bblakely-anl]

Description

For me, there was an issue where sharelatex/nginx were trying to use 127.0.0.1 to access the proxied services, but some were only listening on ::1, and one seemed to be listening on ::1 but redirect to 127.0.0.1. To make things consistent, I disabled IPv6 in that container to ensure they all use 127.0.0.1. An alternative solution would be to make all config references consistent (127.0.0.1 vs "localhost", which may resolve to ::1), but this seems simpler and IPv6 is unlikely to be needed for the internal Docker network in this case.

Related issues / Pull Requests

None

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