Add git checkout to deployment test

.gitlab-ci.yml

@@ -64,7 +64,6 @@ test:
   variables:
     # Tell docker client where it can find the daemon
     DOCKER_HOST: tcp://docker-in-docker:2375/
-    GIT_STRATEGY: none
     DB_PASSWORD: ${STAGING_DB_PASSWORD}
     SUPER_USERNAME: ${STAGING_USERNAME}
     SUPER_EMAIL: ${STAGING_EMAIL}
@@ -84,8 +83,6 @@ test:
   stage: deploy
   tags:
     - wasenweiler.sit-servers.net
-  variables:
-    GIT_STRATEGY: none
   image:
       name: docker/compose:1.24.0
       entrypoint: ["/bin/sh", "-c"]