Add .gitlab-ci.yml

.gitlab-ci.yml

+# This file is a template, and might need editing before it works on your project.
+docker-build-master:
+  # Official docker image.
+  image: zhicwu/pdi-ce:latest
+  stage: build
+
+
+docker-build:
+  # Official docker image.
+  image:  zhicwu/pdi-ce:latest
+  stage: build
+  services:
+    - docker:dind