Persistent keycloak

[bartoval]

Keycloak data and configurations are stored in Postgres (studiodb for semplicity), so if you restart, remove, and recreate Keycloak (or even the database itself), the configurations remain permanent.

Test:
https://skupper-x-vb-skupper-x-2.skupper-0-153f1de160110098c1928a6c05e19444-0000.us-east.containers.appdomain.cloud

user: myskupper and pass: skupper

Other config:
Two new Realm roles were created: van-owner and backbone-admin, then applied to the user myskypper (no need to set the admin role).

Improvements:
Maybe we can to set up a script like this to get the credential locally and set the yaml to read env vars:

# Set environment variables for PostgreSQL configuration
export POSTGRESQL_SERVICE=
export POSTGRESQL_DATABASE=
export POSTGRESQL_USER=
export POSTGRESQL_PASSWORD=

# Set environment variables for Keycloak configuration
export KEYCLOAK_ADMIN=
export KEYCLOAK_ADMIN_PASSWORD=
export KC_PROXY=edge
export KC_DB=
export KC_DB_URL="jdbc:postgresql://$POSTGRESQL_SERVICE/$POSTGRESQL_DATABASE"