Added CI config

.gitlab-ci.yml

+services:
+  - docker:dind
+
+variables:
+  IMAGE_SNAPSHOT: $CI_REGISTRY_IMAGE:snapshot
+  IMAGE: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME
+  IMAGE_LATEST: $CI_REGISTRY_IMAGE:latest
+
+stages:
+  - build
+  - test
+  - release
+
+before_script:
+  - docker version
+  - docker info
+  - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
+
+build:
+  stage: build
+  script:
+    - docker build --pull -t $IMAGE_SNAPSHOT .
+    - docker push $IMAGE_SNAPSHOT
+  tags:
+    - dind
+
+test:
+  stage: test
+  script:
+    - docker pull $IMAGE_SNAPSHOT
+    - docker run $IMAGE_SNAPSHOT rsync --version
+  tags:
+    - dind
+
+release:
+  stage: release
+  script:
+    - docker pull $IMAGE_SNAPSHOT
+    - docker tag $IMAGE_SNAPSHOT $IMAGE
+    - docker push $IMAGE
+  tags:
+    - dind
+  except:
+    - master
+
+release:latest:
+  stage: release
+  script:
+    - docker pull $IMAGE_SNAPSHOT
+    - docker tag $IMAGE_SNAPSHOT $IMAGE_LATEST
+    - docker push $IMAGE_LATEST
+  tags:
+    - dind
+  only:
+    - master