chore: improvements to keycloak local development (#26518)

* update keycloak docker image

* update realm file with a compatible realm

* import realm on start-docker command

Since bitnami's image does not support importing directly, the import of the test realm is done in the make file start-docker action

* Use official image from quay

* updated realm keycloak config

* final note about nickname attrib for saml

* add admin user

* update realm

* Updated from master

* Updated docs

* local typo

* use jq for ldap and saml

* updated readme

server/build/docker-compose.common.yml

@@ -116,7 +116,7 @@ services:
       KC_HOSTNAME_STRICT_HTTPS: 'false'
       KC_HTTP_ENABLED: 'true'
     volumes:
-     - "./docker/keycloak:/opt/keycloak/data/import"
+     - "./docker/keycloak/realm-export.json:/opt/keycloak/data/import/realm-export.json"
   prometheus:
     image: "prom/prometheus:v2.46.0"
     user: root