Plugin seems incompatible with latests versions of Keycloak and GoCD

[foretspaisibles]

I was trying to follow the instructions to configure Keycloak authentication for GoCD. There was a few difficulties since the terminology evolved in Keycloak since the plugin has been written.

Furthermore I found some of the following problems when trying to use the plugin:

• The plugin assumes authentication URLs start with /auth but instead it should get the URL from http://localhost:8080/realms/${realm}/.well-known/openid-configuration

• The plugin requires some scopes that do not exist (groups) in Keycloak 25.0.1, this can be fixed by creating the client scope but would need to be added to the documentation.

Here is the docker compose file I used to conduct my experiment:

docker/compose/gocd.yml 
services:
 keycloak:
  restart: unless-stopped
  image: quay.io/keycloak/keycloak:25.0.1
  ports:
   - "127.0.0.1:8080:8080"
  environment:
   KEYCLOAK_ADMIN: 'admin'
   KEYCLOAK_ADMIN_PASSWORD: 'admin'
   KC_METRICS_ENABLED: 'true'
   KC_HEALTH_ENABLED: 'true'
   ROOT_LOGLEVEL: INFO
  command: start-dev

 gocdserver:
  image: gocd/gocd-server:v24.3.0
  ports:
   - "127.0.0.1:8153:8153"
   - "127.0.0.1:8154:8154"
  environment:
    GOCD_PLUGIN_INSTALL_keycloak-oauth-authorization-plugin: https://github.com/klinux/gocd-keycloak-oauth-authorization-plugin/releases/download/v2.0.0-21-exp/keycloak-oauth-authorization-plugin-2.0.0-21.jar

[foretspaisibles]

The /auth issue seems to be solved by #5.