SSO enhancements

[juliusknorr]

• autogenerate docker/configs/keycloak/realm-export.json with proper domain suffix a9be636
• add script to auto configure oidc
• add script to auto configure saml
• Document behavior and mention it in the changelog 📝 Changelog #104
• Checkout if we can make keycloak realm configuration more dynamic Added field to the RealmImport spec to replace environment variables within the realm import keycloak/keycloak#31232

[juliusknorr]

First steps in #123

[juliusknorr]

Did a bit more work in a9be636

Still needs to have proper certificate/key handling implemented for automatic configuration