Update .gitlab-ci.yml file

.gitlab-ci.yml

-default:
-  image: $CI_REGISTRY_IMAGE:latest
-
-variables:
-  CAMPUS_IP: 138.26.48.47
-  TEST_IP: 	138.26.48.62
-  ANSIBLE_REMOTE_TMP: "/tmp"
-  AWS_DEFAULT_REGION: "bhm"
-  OS_AUTH_TYPE: "v3applicationcredential"
-  OS_AUTH_URL: "https://keystone.cloud.rc.uab.edu:5000/v3"
-  OS_IDENTITY_API_VERSION: "3"
-  OS_INTERFACE: "public"
-  OS_REGION_NAME: "bhm1"
-  PKR_VAR_flavor: "m1.small"
-  PKR_VAR_source_image: "CentOS-7-x86_64-GenericCloud-2009"
-  PKR_VAR_floating_ip_network: "uab-campus"
-  PKR_VAR_security_groups: '["allow-ssh"]'
-  PKR_VAR_skip_create_image: "false"
-  PKR_VAR_ssh_username: "centos"
-  PKR_VAR_networks: '["256e12b8-685e-48bf-ad47-b0985c9383c0"]'
-  GIT_AUTHOR_NAME: "Gitlab runner"
-  GIT_AUTHOR_EMAIL: "gitlab@runner"
-  NUM_SERVER_TO_KEEP: 5
-  NUM_IMAGE_TO_KEEP: 30
-  PACKER_VER: 1.8.3
-
 stages:          # List of stages for jobs, and their order of execution
   - build
   - test
@@ -31,6 +5,7 @@ stages:          # List of stages for jobs, and their order of execution
 
 build-job:       # This job runs in the build stage, which runs first.
   stage: build
+  tags: [build]
   script:
     - echo "Compiling the code..."
     - echo "Compile complete."