Update CI for nomad-based gitlab runners

.gitlab-ci.yml

@@ -1,26 +1,9 @@
-# This file is a template, and might need editing before it works on your project.
-# Official docker image.
-image: docker:latest
+image: docker:dind
 
 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.
-  #
-  # 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://localhost:2375/
-  # When using dind, it's wise to use the overlayfs driver for
-  # improved performance.
-  DOCKER_DRIVER: overlay2
-  
   CONTAINER_TEST_IMAGE: "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG"
   CONTAINER_RELEASE_IMAGE: "$CI_REGISTRY_IMAGE:latest"
 
-services:
-   - docker:dind
-
 stages:
   - build
   - release