act_runner/examples/docker-compose/README.md

Running act_runner using docker-compose

...
  gitea:
    image: gitea/gitea
    ...

  runner:
    image: gitea/act_runner
    restart: always
    depends_on:
      - gitea
    volumes:
      - ./data/act_runner:/data
      - /var/run/docker.sock:/var/run/docker.sock
    environment:
      - GITEA_INSTANCE_URL=<instance url>
      # When using Docker Secrets, it's also possible to use
      # GITEA_RUNNER_REGISTRATION_TOKEN_FILE to pass the location.
      # The env var takes precedence
      - GITEA_RUNNER_REGISTRATION_TOKEN=<registration token>