[Feature Request] Allow to run different instances of homepage with docker service discovery match

[mrjk]

Description

It is not possible to run more than one homepage instance with docker service discovery enabled. If you do so, all instance would exactly show the same content, because they all discover the same services in docker. A possible feature would be to allow to check container label to see it if would be accepted as discovered service or not, a bit like Traefik already allows to do with the group option on container labels. Having the possibility to use a regex would be a must, but a simple string would resolve 99% usecase.

Example:
hp.home.com
=> Homepage display only containers having a label that match the regex "home-."
hp.work.com
=> Homepage display only containers having a label that match the regex "work-."

Other

I'm not a js script guy at all, but adding a condition in this block would allow to filter out undesired containers:

https://github.com/benphelps/homepage/blob/f6b1304e22f8c742db77c8387bc04c228b89e5ed/src/utils/config/service-helpers.js#L45

[ArgentumCation]

I think I have a (potentially partial) solution to this, I'll make a PR in a bit

[mrjk]

@ArgentumCation Did you had any chance to come with something ? :) Cheers

[ArgentumCation]

The PR (#776) was ultimately declined since it didn't really comply with dockers guidelines on labeling. Unfortunately I couldn't find a way to fix that issue

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