Создать в /data/pgadmin

$ cat docker-compose.yml
version: "2.4"
#docker run -p 20080:80 \
#    -e 'PGADMIN_DEFAULT_EMAIL=agis@agis.kz' \
#    -e 'PGADMIN_DEFAULT_PASSWORD=12345' \
#    -d dpage/pgadmin4:5.2
services:
    pgAdmin:
        container_name: pgadmin
        image: dpage/pgadmin4:6.2
        ports:
            - "20080:80"
        environment:
            PGADMIN_DEFAULT_EMAIL: agis@agis.kz
            PGADMIN_DEFAULT_PASSWORD: 12345
        volumes:
            - ./pgadmin:/var/lib/pgadmin
        ports:
           - 20080:80
        restart: on-failure
        cpus: 2
        mem_limit: 6gb
$ cat .env
COMPOSE_PROJECT_NAME=pgadmin
$ mkdir pgadmin
$ sudo chown 5050:5050 pgadmin
$ ls -la
total 8
drwxrwxr-x 3 agis agis  59 Nov 27 01:34 .
drwxr-xr-x 6 agis agis 165 Nov 27 01:02 ..
-rw-rw-r-- 1 agis agis 565 Nov 27 01:16 docker-compose.yml
-rw-rw-r-- 1 agis agis  29 Nov 27 01:00 .env
drwxrwxr-x 2 5050 5050   6 Nov 27 01:34 pgadmin
$ docker-compose up -d
Creating network "pgadmin_default" with the default driver
Creating pgadmin ... done
$ docker-compose ps -a
 Name        Command       State                        Ports
----------------------------------------------------------------------------------
pgadmin   /entrypoint.sh   Up      443/tcp, 0.0.0.0:20080->80/tcp,:::20080->80/tcp

Идем http://localhost:20800 User: agis@agis.kz Passwd: 12345