Respeta comando original y añade el de registro

services:

  gitlab-runner:

    image: gitlab/gitlab-runner:${IMAGE_TAG:-latest}

    entrypoint: /bin/sh -c

    command: |

      gitlab-runner register \

      run \

        --user=gitlab-runner \

        --working-directory=/home/gitlab-runner

      register \

        --url "${GITLAB_URL}" \

        --registration-token "${GITLAB_TOKEN}" \

        --name "${RUNNER_NAME}" \