Add CI integration for GitLab

Although this mode is still not canonically hosted on GitLab,
https://gitlab.com/joewreschnig/apt-sources-list-mode contains a
CI-enabled mirror.

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
new file mode 100644 (file)
index 0000000..f244aaf
--- /dev/null
+++ b/.gitlab-ci.yml
@@ -0,0 +1,6 @@
+image: "registry.gitlab.com/joewreschnig/emacs-cask-docker-image:alpine-edge"
+
+test:
+  stage: test
+  script:
+    - make