Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -1,4 +1,32 @@
-image: docker:stable
+image: docker:20.10.16
+
+variables:
+  # When using dind service, you must 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.
+  DOCKER_HOST: tcp://docker:2376
+  #
+  # The 'docker' hostname is the alias of the service container as described at
+  # https://docs.gitlab.com/ee/ci/services/#accessing-the-services.
+  # If you're using GitLab Runner 12.7 or earlier with the Kubernetes executor and Kubernetes 1.6 or earlier,
+  # the variable must be set to tcp://localhost:2376 because of how the
+  # Kubernetes executor connects services to the job container
+  # DOCKER_HOST: tcp://localhost:2376
+  #
+  # Specify to Docker where to create the certificates. Docker
+  # creates them automatically on boot, and creates
+  # `/certs/client` to share between the service and job
+  # container, thanks to volume mount from config.toml
+  DOCKER_TLS_CERTDIR: "/certs"
+  # These are usually specified by the entrypoint, however the
+  # Kubernetes executor doesn't run entrypoints
+  # https://gitlab.com/gitlab-org/gitlab-runner/-/issues/4125
+  DOCKER_TLS_VERIFY: 1
+  DOCKER_CERT_PATH: "$DOCKER_TLS_CERTDIR/client"
+
+services:
+  - docker:20.10.16-dind
 
 stages:         
   - build