Can't install runner

This should be trivial, but maybe I’m overlooking something.

I try to setup drone with a docker runner:

version: '3'

services:
  drone:
    image: drone/drone:2
    restart: unless-stopped
    environment:
      - DRONE_GITEA_SERVER=
      - DRONE_GITEA_CLIENT_ID=
      - DRONE_GITEA_CLIENT_SECRET=
      - DRONE_RPC_SECRET=
      - DRONE_SERVER_HOST=
      - DRONE_SERVER_PROTO=
    ports:
      - 8811:80

  runner:
    image: drone/drone-runner-docker:1
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    environment:
      - DRONE_RPC_PROTO=
      - DRONE_RPC_HOST=
      - DRONE_RPC_SECRET=
      - DRONE_RUNNER_CAPACITY=2
      - DRONE_RUNNER_NAME=
    restart: unless-stopped

Logs of start:

drone-ci-drone-1  | {"interval":"30m0s","level":"info","msg":"starting the cron scheduler","time":"2023-04-27T10:09:33Z"}
drone-ci-drone-1  | {"interval":"24h0m0s","level":"info","msg":"starting the zombie build reaper","time":"2023-04-27T10:09:33Z"}
drone-ci-drone-1  | {"acme":false,"host":"drone.domain.tld","level":"info","msg":"starting the http server","port":":80","proto":"https","time":"2023-04-27T10:09:33Z","url":"https://drone.domain.tld"}
drone-ci-runner-1  | time="2023-04-27T10:34:53Z" level=info msg="starting the server" addr=":3000"
drone-ci-runner-1  | time="2023-04-27T10:34:53Z" level=info msg="successfully pinged the remote server"
drone-ci-runner-1  | time="2023-04-27T10:34:53Z" level=info msg="polling the remote server" arch=amd64 capacity=2 endpoint="http://drone" kind=pipeline os=linux type=docker

But when trying to run a build from a repo with image: plugins/docker:

latest: Pulling from plugins/docker
Digest: sha256:dfd5140bb8b1bc698cc45e221d58da18d61b6873c7ac49c99c50e38b74786c49
Status: Image is up to date for plugins/docker:latest
+ /usr/local/bin/dockerd --data-root /var/lib/docker --host=unix:///var/run/docker.sock
Unable to reach Docker Daemon after 15 attempts.
Registry credentials or Docker config not provided. Guest mode enabled.
+ /usr/local/bin/docker version
Client:
 Version:           20.10.14
 API version:       1.41
 Go version:        go1.16.15
 Git commit:        a224086
 Built:             Thu Mar 24 01:45:09 2022
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
exit status 1
Unable to reach Docker Daemon after 15 attempts.
Registry credentials or Docker config not provided. Guest mode enabled.
+ /usr/local/bin/docker version
Client:
 Version:           20.10.14
 API version:       1.41
 Go version:        go1.16.15
 Git commit:        a224086
 Built:             Thu Mar 24 01:45:09 2022
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
exit status 1

I tried modifying permissions, but nothing worked… Am I missing something?