Document configuration via environment variables in the wiki

[b-errouane]

Librespot implements the usage of environment variables instead of CLI parameters for configuration. I only found out because I did go through the code. It would have been nice to have it documented here.

[roderickvd]

True. Would you add the documentation? The wiki is editable by everyone.

[b-errouane]

Yep I will do it. I didn't notice the edit option.

[roderickvd]

Great stuff. Feel free to close this issue when you're done.

[JasonLG1979]

It's documented in the change log. Any cli arg you can pass to librespot can also be passed as an env var by prefixing it with LIBRESPOT_, making it all caps and replacing any -'s with _'s. So option foo-bar becomes LIBRESPOT_FOO_BAR. You can also use that ability to create a makeshift config file of sorts if you're using systemd to daemonize it as I do in Raspotify. (That was my motivation for adding the feature)

[b-errouane]

Took some time because I had other things going on. I took the liberty to use @JasonLG1979 s comment as a basis for the wiki change.

[roderickvd]

Thanks 👍