use exisiting docker-compose image

.gitlab-ci.yml

@@ -5,8 +5,6 @@ variables:
   DOCKER_HOST: "$DEPLOYMENT_HOST"
   DOCKER_TLS_VERIFY: "1"
   DOCKER_CERT_PATH: "certs"
-  DOCKER_COMPOSE_VERSION: 1.14.0
-  PY_DOCKER_VERSION: 2.4.2
 
 stages:
   - deploy
@@ -17,10 +15,6 @@ review:
     - develop
   environment: review
   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
@@ -34,7 +28,7 @@ review:
     - docker-compose up -d
   after_script:
     - docker-compose rm -f
-  image: docker:17
+  image: docker/compose:1.14.0
   tags:
     - docker