Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -7,13 +7,13 @@ stages:
 build-push-docker-image-job:
   stage: dockerize
   # Specify a Docker image to run the job in.
-  image: docker
+  image: docker:20-dind
   # Specify an additional image 'docker:dind' ("Docker-in-Docker") that
   # will start up the Docker daemon when it is brought up by a runner.
   before_script:
     - docker login -u "$DOCKER_REGISTRY_USER" -p "$DOCKER_REGISTRY_PASSWORD" $DOCKER_REGISTRY_URL # Instructs GitLab to login to its registry
   services:
-    - name: docker
+    - name: docker:20-dind
       alias: docker
       command: ["--tls=false"]
   script: