Mounting & using /var/run/docker.sock in a container not running as root

Docker Desktop
8

Never change the permission of your mounted socket file inside the container! It will be changed on the host too.
You can use socat as root forward a tcp socket to a unix socket. This is how I did it: httpd24-docker-image/local-builder.yml at d8f6807ee454b42ed11b044e5e84da3af0bf5372 · itsziget/httpd24-docker-image · GitHub

version: "3.7"

services:
  socat:
    image: alpine/socat
    command: tcp-listen:2375,fork,reuseaddr unix-connect:/var/run/docker.sock
    user: root
    volumes:
      - type: bind
        source: /var/run/docker.sock
        target: /var/run/docker.sock
    network_mode: host

  ci:
    depends_on:
      - socat
    build:
      dockerfile: local-builder.Dockerfile
      context: .
    environment:
      DOCKER_HOST: localhost:2375
    network_mode: host

I used the host network but it should work without it setting DOCKER_HOST to the right value.