added Gitlab CI config

.gitlab-ci.yml

+variables:
+  GIT_SUBMODULE_STRATEGY: normal
+  DOCKER_COMPOSE_VERSION: 1.14.0
+  PY_DOCKER_VERSION: 2.4.2
+  CI: "true"
+
+stages:
+  - deploy
+
+deploy:
+  stage: deploy
+  only:
+    - develop
+  environment: review
+  variables:
+    COMPOSE_TLS_VERSION: "TLSv1_2"
+    DOCKER_HOST: "$DEPLOYMENT_HOST"
+    DOCKER_TLS_VERIFY: "1"
+    DOCKER_CERT_PATH: "certs"
+  before_script:
+    - apk add --no-cache py-pip
+    - pip install --upgrade pip
+    - pip install docker-compose==$DOCKER_COMPOSE_VERSION
+    - pip install -U docker==$PY_DOCKER_VERSION
+    - mkdir -p $DOCKER_CERT_PATH
+    - echo "$DEPLOYMENT_CACERT"      > $DOCKER_CERT_PATH/ca.pem
+    - echo "$DEPLOYMENT_CLIENT_CERT" > $DOCKER_CERT_PATH/cert.pem
+    - echo "$DEPLOYMENT_CLIENT_KEY"  > $DOCKER_CERT_PATH/key.pem
+    - docker --version
+    - docker-compose --version
+    - docker info
+  script:
+    - docker-compose pull
+    - docker-compose build --no-cache
+    - docker-compose up -d
+  after_script:
+    - docker-compose rm -f
+  image: docker:17
+  dependencies:
+    - build_job
+  tags:
+    - docker