Update .gitlab-ci.yml

.gitlab-ci.yml

- jenkins:
-    image: jenkins
-    environment: 
-      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
-    ports: 
-      - "8080:80"
-
-  gitlab:
-    image: gitlab/gitlab-ce:latest
-    ports:
-      - "8000:80"
-      - "8822:22"
-    volumes:
-      - ./config/gitlab:/etc/gitlab
-      - ./data/gitlab:/var/opt/gitlab
-      - ./logs:/var/log/gitlab
-
-  gitlab-runner:
-    image: gitlab/gitlab-runner:latest
-    depends_on: 
-      - gitlab
-    volumes:
-      - ./config/gitlab-runner:/etc/gitlab-runner
-      - /var/run/docker.sock:/var/run/docker.sock
\ No newline at end of file
+hello:
+    image: ubuntu:16.04
+    script:
+        - echo "Hello World"
\ No newline at end of file