Use Docker socket binding

.gitlab-ci.yml

@@ -1,24 +1,5 @@
 image: docker:stable
 
-variables:
-  # When using dind service we need to instruct docker, to talk with the
-  # daemon started inside of the service. The daemon is available with
-  # a network connection instead of the default /var/run/docker.sock socket.
-  #
-  # The 'docker' hostname is the alias of the service container as described at
-  # https://docs.gitlab.com/ee/ci/docker/using_docker_images.html#accessing-the-services
-  #
-  # Note that if you're using Kubernetes executor, the variable should be set to
-  # tcp://localhost:2375 because of how Kubernetes executor connects services
-  # to the job container
-  DOCKER_HOST: tcp://docker:2375/
-  # When using dind, it's wise to use the overlayfs driver for
-  # improved performance.
-  DOCKER_DRIVER: overlay2
-
-services:
-  - docker:dind
-
 before_script:
   - docker info