Allow custom configuration of ExApps #45

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Feature request

Which Nextcloud Version are you currently using: 30 and master

Is your feature request related to a problem? Please describe.
I have multiple NC instances on the same docker host. I would like to enable ExApps for all of them but I fear this could break stuff especially as the docker host is shared.

Describe the solution you'd like
It would be nice if have a configuration about the created containers. This could allow for custom docker networking, DNS settings, etc. It would be important to allow some sort of templating (e.g. to define the name of the newly created container to be like nc1-exapp-%s).

If there is no problem in sharing the ExApps (which would be 💯 ), this should be mentioned in the docs.

Describe alternatives you've considered
Define a custom prefix apart from nc_app_ on a per-instance (dsp instance) basis to separate the containers.

Additional context
Already posted on the forum here. See also for a bit more information.