Change the auth code shared URL for self-hosted

[jecal22]

I am self-hosting the ente suite and have everything working perfectly under my custom domains. The only thing I have noticed is when sharing an auth code, the URL is being presented as https://auth.ente.io/share... instead of https://auth.<mydomain.com>/share. I think it has to do with the line in code_share.dart where it appears auth.ente.io is hard coded. Perhaps this can be set as a variable which can be set in the musum.yaml under the apps section along with the other self-hosted app URL declarations?

ente/mobile/apps/auth/lib/ui/share/code_share.dart

Line 121 in b6a22f1

'https://auth.ente.io/share?data=${_uint8ListToUrlSafeBase64(encResult.encryptedData!)}&header=${_uint8ListToUrlSafeBase64(encResult.header!)}#${_uint8ListToUrlSafeBase64(key)}';