Add GitLab dependency CI file

**Why**: Because Gemnasium was bought by GitLab.
https://docs.gitlab.com/ee/user/project/import/gemnasium.html#doc-nav

.gitlab-ci.yml

@@ -0,0 +1,16 @@
+dependency_scanning:
+  image: docker:stable
+  variables:
+    DOCKER_DRIVER: overlay2
+  allow_failure: true
+  services:
+    - docker:stable-dind
+  script:
+    - export SP_VERSION=$(echo "$CI_SERVER_VERSION" | sed 's/^\([0-9]*\)\.\([0-9]*\).*/\1-\2-stable/')
+    - docker run
+        --env DEP_SCAN_DISABLE_REMOTE_CHECKS="${DEP_SCAN_DISABLE_REMOTE_CHECKS:-false}"
+        --volume "$PWD:/code"
+        --volume /var/run/docker.sock:/var/run/docker.sock
+        "registry.gitlab.com/gitlab-org/security-products/dependency-scanning:$SP_VERSION" /code
+  artifacts:
+    paths: [gl-dependency-scanning-report.json]