Update .gitlab-ci.yml file

.gitlab-ci.yml

 image: docker:latest
 services:
     - docker:dind
+
 variables:
     LATEST_VER: "registry.gitlab.com/synchrotron-soleil/control-system/containers/dev-el6:latest"
+
 stages:
-    - Build image and Push to Docker Hub
-docker build and push:
-    stage: Build image and Push to Docker Hub
+    - build
+
+build-job:
+    stage: build
     only:
         - master
     before_script: