Linux Keyring (gnome-keyring) #54

We should call org.freedesktop.secrets over DBUS using keybase/go-keychain. The fallback libsecret provides is still reliant on the user having a GUI because of the reliance on org.freedesktop.portal.

At a later point we could also move entirely to dbus and replace keybase/go-keychain. We could then also replace the underlying dbus library keybase relies on with godbus/dbus.