[FEATURE REQUEST] Support proxy using kerberos

[papanito]

If you are sitting behine a corporate proxy, eget should use proxy information as per #29

However, some companies using Kerberos as authentication method which requires authentication against the proxy.

So currently if I want to use eget I get "authenticationrequired"

eget jesseduffield/lazygit
Get "https://api.github.com/repos/jesseduffield/lazygit/releases/latest": authenticationrequired

I am no go expert so nor sure if these links help

• https://pkg.go.dev/gopkg.in/jcmturner/gokrb5.v8
• https://github.com/dpotapov/go-spnego/blob/master/spnego_gokrb5.go