docker-compose for default spring boot app

docker-compose.yml

version: "3.7"

services:
  app:
    image: gradle:jdk11
    container_name: app
    working_dir: /app
    user: gradle
    command:
      - sleep
      - infinity
    environment:
      SPRING_DATASOURCE_URL: jdbc:postgresql://${DATABASE_HOST}:${DATABASE_PORT}/${DATABASE_NAME}
      SPRING_DATASOURCE_USERNAME: $DATABASE_USER
      SPRING_DATASOURCE_PASSWORD: $DATABASE_PASSWORD
      SPRING_PROFILES_ACTIVE: dev
    ports:
      - "127.0.0.1:20080:8080"
    volumes:
      - ".gradle:/home/gradle/.gradle"
      - "./:/app"
    depends_on:
      - db

  db:
    image: postgres:12-alpine
    container_name: db
    environment:
      PGDATABASE: $DATABASE_NAME
      POSTGRES_DB: $DATABASE_NAME
      PGUSER: $DATABASE_USER
      POSTGRES_USER: $DATABASE_USER
      PGPASSWORD: $DATABASE_PASSWORD
      POSTGRES_PASSWORD: $DATABASE_PASSWORD
    ports:
      - "127.0.0.1:16432:5432"
    volumes:
      - postgres_data:/var/lib/postgresql/data

volumes:
  postgres_data:
    driver: local