allow manually pasting the sign-in url to make it easier to sign in in a different browser

[trondhindenes]

when running auth0 login it's too hard to use a non-default browser to sign in. It would help a lot if the cli printed the sign-in url so that one could paste it into the correct browser. I'm a little surprised that not even the --debug option seems to print this info.

I build a custom binary whith the sign-in url printed, but it looks like there's more logic needed, since the cli will wait for the browser process to close before doing anything - looks like more is needed than I have the golang skills to code here.

[Widcket]

Hi @trondhindenes, thanks for raising this. We could have some option to output the login URL, instead of opening a browser.