Upgrading to the KeyCloak 26.x version

[peter279k]

Description

• As title, the KeyCloak 23.x version is outdated and it should upgrade to the latest version.
• Upgrading KeyCloak version steps are as follows:

1. Modifiying the docker-compose-http.yml file. The reference is as follows:

services:
  keycloak:
    image: quay.io/keycloak/keycloak:26.3.2 # Use the desired Keycloak 26 version
    container_name: keycloak
    ports:
      - "8080:8080" # Map Keycloak's default port
    environment:
      KC_DB: postgres
      KC_DB_URL_HOST: postgres_db
      KC_DB_URL_DATABASE: keycloak
      KC_DB_USERNAME: keycloak
      KC_DB_PASSWORD: password
      KC_HOSTNAME: nifi.peterli.website # Adjust as needed for your environment
      KC_HOSTNAME_STRICT: "false" # Set to "true" for production with proper hostname
      KC_PROXY_HEADERS: "xforwarded" # Important if behind a reverse proxy
      KC_HTTP_ENABLED: "false" # Enable HTTP for development, use HTTPS in production
      KC_BOOTSTRAP_ADMIN_USERNAME: admin
      KC_BOOTSTRAP_ADMIN_PASSWORD: admin
    command: start-dev # Use 'start' for production
    volumes:
      - ./keycloak_data:/opt/keycloak/data
    depends_on:
      - postgres_db
    networks:
      - keycloak-net

  postgres_db:
    image: postgres:16 # Use a compatible PostgreSQL version
    container_name: postgres_db
    environment:
      POSTGRES_DB: keycloak
      POSTGRES_USER: keycloak
      POSTGRES_PASSWORD: password
    volumes:
      - ./postgres_data:/var/lib/postgresql/data
    networks:
      - keycloak-net

networks:
  keycloak-net:
    driver: bridge

2. Modifying the https://github.com/peter279k/fmsa/blob/master/api_gateway/app/modules.py#L28 file and change the logic of KeyCloakAdmin class.
3. Supporting the password and client_credentials grant types
4. Adding or modifying the admin_login method.
5. Adding or modifying the create_realm method.
6. Adding or modifying the create_client method.
7. Adding or modifying the create_user method.
8. Don't forget adding some unit tests for this issue.