redmine on postgresql

docker-compose.yml

version: "3"

volumes:
  redmine_files:
  postgresql_data:

services:

  redmine:
    image: redmine:4.0
    restart: always
    volumes:
      - redmine_files:/usr/src/redmine/files
    ports:
      - 8000:3000
    environment:
      REDMINE_DB_POSTGRESQL: db
      REDMINE_DB_USERNAME: redmine
      REDMINE_DB_PASSWORD: blah

  db:
    image: postgres:11
    restart: always
    environment:
      POSTGRESQL_DATABASE: redmine
      POSTGRES_USER: redmine
      POSTGRES_PASSWORD: blah
    volumes:
      - postgresql_data:/var/lib/postgresql/data