Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -15,6 +15,10 @@ build:
 deploy:
   stage: deploy
   image: docker:latest
+  variables:
+    DOCKER_HOST: tcp://localhost:2375/
+    DOCKER_DRIVER: overlay2
+    DOCKER_TLS_CERTDIR: ""
   services:
     - name: docker:dind
       command: ["--tls=false"]