Fix URL pattern for Quarkus distribution

[ahus1]

This makes the "/auth" prefix optional.

In order to test it with the minikube setup, I needed to manually:

• enable user self-registration in realm-0
• created a client "client-0" with a valid redirect URL - I chose "https://keycloak.xxx.xxx.xxx.xxx.nip.io/*" (replace with the the current IP address)
• created a "user-0" with a password "user-0-password"

I wonder if this could be automated more using dataset provider or the shell script or a mixture of both.

Closes #122

[kami619]

@ahus1 I like the Idea to automate the setting up of realm, client and user part. I think we can either use kcb.sh or dataset provider, to achieve that. I would look into creating a PR for it.

[kami619]

this works as expected