Added CI

.gitlab-ci.yml

+stages:
+  - dockerize
+
+variables:
+  # to avoid "fatal: git fetch-pack: expected shallow list"
+  GIT_STRATEGY: clone
+
+dockerize_file_catalog:
+  stage: dockerize
+  tags:
+    - shell
+  only:
+    - master
+  script:
+    - docker login -u "${CI_REGISTRY_USER}" -p "${CI_REGISTRY_PASSWORD}" "${CI_REGISTRY}"
+    - docker build -t "${CI_REGISTRY_IMAGE}" .
+    - docker push "${CI_REGISTRY_IMAGE}"