Add CI

.gitlab-ci.yml

+stages:
+  - build
+  - test
+  - push
+  - deploy
+
+
+before_script:
+  - docker login -u gitlab-ci-token -p ${CI_BUILD_TOKEN} ${CI_REGISTRY}
+  # testing is implicitly done at image build time
+  - docker build -t ${CI_PROJECT_NAME} .
+
+
+push_dev:
+  stage: push
+  only:
+    - master
+  script:
+    - docker tag ${CI_PROJECT_NAME} ${CI_REGISTRY_IMAGE}:${CI_COMMIT_SHA:0:7}
+    - docker push ${CI_REGISTRY_IMAGE}:${CI_COMMIT_SHA:0:7}
+    - docker tag ${CI_PROJECT_NAME} ${CI_REGISTRY_IMAGE}:latest
+    - docker push ${CI_REGISTRY_IMAGE}:latest
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