feat: add docker support

[ajnart]

Need to add docker support with dockerproxy as well as multiple docker instances (separated by commas in the docker env variable) as well as utility functions to find and quickly add docker-relate service.

[Meierschlumpf]

Missing from here is the container add button

[loxoron218]

Missing from here is the container add button

Has the add button been implemented? :)

[manuel-rw]

Yes. See Tools > Docker

[loxoron218]

Thanks, I see! Are you planing on implementing it back to the add button, as it was on 0.x? Or does that have any drawbacks?

In my opinion it makes more sense to have it there and is much more intuitive. Especially as it was possible to add all containers at once :)

[manuel-rw]

Please see #2165.