default database/user using docker-compose

 version: '3.2'

volumes:
  clickhouse-data:

services:
  clickhouse:
    image: yandex/clickhouse-server:20.3
    environment:
      # Default user and database will be created using `init-defaults.sh` script
      CLICKHOUSE_DB: my_db_name
      CLICKHOUSE_USER: clickhouse-user
      CLICKHOUSE_PASSWORD: secret
    ulimits:
      nproc: 65535
      nofile:
        soft: 262144
        hard: 262144
    volumes:
      - clickhouse-data:/var/lib/clickhouse:cached
      - ./docker/clickhouse/init-defaults.sh:/docker-entrypoint-initdb.d/init-defaults.sh:ro
    ports:
      - 9000/tcp

from: https://github.com/ClickHouse/ClickHouse/issues/10339