Use webfinger for OIDC parameter discovery

[rhafer]

To solve many of the issues our users have with getting OpenCloud to work with different IDPs we
came up with a more generic way for how clients should discover their OIDC setttings (issuer, client_id and scopes). This is described here: https://github.com/opencloud-eu/opencloud/blob/main/docs/adr/0003-oidc-client-config-discovery.md

And implemented in: opencloud-eu/opencloud#2072

Now we need to implement this mechanism in our clients.

[guruz]

Can you ping me when you deployed this on demo.opencloud.eu?
Seems not there yet.
https://demo.opencloud.eu/.well-known/webfinger?resource=https://demo.opencloud.eu/&rel=http://openid.net/specs/connect/1.0/issuer&platform=android (if that's the right way to call it..)

CC @micbar

[micbar]

That will be part of the opencloud 5.2.0 rolling release.

[micbar]

@Svanvith @ScharfViktor can you use our instance launcher to provide an instance for @guruz with the daily release?

[guruz]

thanks a lot. feel free to e-mail me or write me privately on Matrix..