gitlab-ci; add submodules init step

.gitlab-ci.yml

@@ -10,6 +10,7 @@ deploy_docker:
   services:
     - docker:dind
   script:
+    - make init_submodules
     - export CUR_DATE=`date +%Y-%m-%d`
     - export SHA=`echo $CI_COMMIT_SHA | awk '{ print substr($0, 0, 8) }'`
     - export TAG="vidjil/metrics:$CUR_DATE-$SHA"