Update docker-in-docker config

.gitlab-ci.yml

@@ -1,16 +1,32 @@
 # This file is a template, and might need editing before it works on your project.
 # Official docker image.
-image: docker:dind
+image: docker:latest
+
+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
 
-variables:
-  CONTAINER_TEST_IMAGE: "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG"
-  CONTAINER_RELEASE_IMAGE: "$CI_REGISTRY_IMAGE:latest"
-
 before_script:
+  - docker info
   - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" "$CI_REGISTRY"
 
 build: