Support multiple redirection URI for OAuth 2.0 clients

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Is your feature request related to a problem? Please describe.
I'd like to get rid of google oauth integration I use in oauth2_proxy (https://github.com/oauth2-proxy/oauth2-proxy)

Currently I use oauth2_proxy as a proxy (ahem) for multiple services hosted behind the same domain name (me.toto.com, you.toto.com,hello.toto.com) and I use only one client id/secret, and add multiple "Authorized redirect URIs" in google console

Describe the solution you'd like
The same thing in google console, i.e. being able to specify multiple redirection URI for OAuth 2.0 clients

Describe alternatives you've considered
Maybe we could have some kind of wildcards? https://*.toto.com

One solution for me would be to run one instance of oauth2_proxy behind each service, and have a pair client_id/secret for each services, not really usable right now unfortunately

Additional context
Thanks for your amazing work, I'm getting each day a little bit more degoogleized

No files, tests, or entry points are named. Start by locating the OAuth 2.0 client configuration in the Nextcloud server repository and trace how authorized redirect URIs are handled; done means the requested multiple-URI behavior works without requiring separate client credentials.