Support container_name modification

[posixcompliance]

Hi as far as I can tell there is no way to specify the container_name value without manually modifying the following compose file under lib/. I think that this would be a nice feature to include in config/overleaf.rc to allow for multiple toolkit or custom docker-compose.yml files of the main overleaf/overleaf to be deployed to the same docker daemon for testing purposes. https://github.com/overleaf/toolkit/blob/e8b536cad7b89ccf6fb53d40f3a97c4a7fa8d32b/lib/docker-compose.base.yml#L8

[AnzhiZhang]

You need to create a docker-compose.override.yml file.

See https://github.com/overleaf/toolkit/blob/master/doc/configuration.md#the-docker-composeoverrideyml-file

A quick example

services:
    sharelatex:
        container_name: overleaf-sharelatex
    mongo:
        container_name: overleaf-mongo
    redis:
        container_name: overleaf-redis