Shared Postgres socket for Docker Compose

docker-compose.yml

version: '3.5'
services:
  postgres:
    container_name: postgres
    image: postgres:14-bullseye
    environment:
      POSTGRES_PASSWORD: password
    volumes:
      - "./postgres/socket:/var/run/postgresql"
  app:
    container_name: app
    image: postgres:12-bullseye
    user: postgres
    volumes:
      - "./postgres/socket:/var/run/postgresql"
    entrypoint: ["psql", "-h", "/var/run/postgresql", "-c", "SELECT version()"]
    depends_on:
      - postgres