Adding .gitlab-ci.yml for commits to master. ES-99

.gitlab-ci.yml

+#Execute repo sync and run vesta-300-developer build
+stages:
+  - setup
+  - build
+  - shutdown
+
+setup:
+  stage: setup
+  only: 
+    - master
+  script:
+  - docker start vesta-builds
+
+build:
+  stage: build
+  only: 
+    - master
+  script:
+  - docker exec -i vesta-builds bash < build.sh
+
+shutdown:
+  stage: shutdown
+  only: 
+    - master
+  script:
+  - docker stop vesta-builds