Docker Compose config to postgres and dpage/pgadmin4

docker-compose-pgadmin.yml

version: '3.5'

services:
    postgres:
        container_name: postgres_container
        image: postgres
        environment:
          POSTGRES_USER: ${POSTGRES_USER:-postgres}
          POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-postgres}
          POSTGRES_DB: ${POSTGRES_DB:-app_db}
        volumes:
            - postgres:/data/postgres
        ports:
            - "5432:5432"
        networks:
            - postgres
        restart: unless-stopped

    pgadmin:
        container_name: pgadmin_container
        image: dpage/pgadmin4
        environment:
            PGADMIN_DEFAULT_EMAIL: ${PGADMIN_DEFAULT_EMAIL:-pgadmin4@pgadmin.org}
            PGADMIN_DEFAULT_PASSWORD: ${PGADMIN_DEFAULT_PASSWORD:-admin}
            PGADMIN_CONFIG_SERVER_MODE: 'False'
        volumes:
            - pgadmin:/var/lib/pgadmin
        ports:
            - "${PGADMIN_PORT:-5050}:80"
        networks:
            - postgres
        restart: unless-stopped

networks:
    postgres:
        driver: bridge

volumes:
    postgres:
    pgadmin: