[oauth] add host config option

[martinjuhasz]

There might be situations where you want to bind your oauth web server to something other than localhost.

F.e. if you use gallery-dl in a docker environment and you want to expose the oauth port to its network, there is currently no way as you need to bind the host to 0.0.0.0 to be able to forward ports.

[martinjuhasz]

@mikf not sure why tests fail. Does not seem to be related to my change

[mikf]

Yeah, those errors are unrelated to your changes.
(they are caused by dd3a6a9, and fixed in c0051d7, which got pushed more than a week later ...)

Thanks for the PR.

[Draic]

I am facing this problem at the moment but the host option does not seem to work for me. Where in the config must this be added? I tried several ways but the OAuth always tries localhost and gallery-dl isn't listening when I try to manually redirect to the servers IP

[martinjuhasz]

hi @Draic , this PR has been merged but there has not been a new release of gallery-dl yet. I guess with the next release you will be able to use this option. Or pull directly from master here.