fix: repoSlug for GitLab CI (#231)

* Fix repoSlug

Fix a misunderstanding because Greenkeeper and GitLab define a "slug" differently.

* add more debugging output

* more debug output

* add origin to checkout

* cleanup

Author: baer95

ci-services/gitlab.js

@@ -3,7 +3,7 @@
 const env = process.env
 
 module.exports = {
-  repoSlug: env.CI_PROJECT_PATH_SLUG,
+  repoSlug: env.CI_PROJECT_PATH,
   branchName: env.CI_COMMIT_REF_NAME,
   correctBuild: /^greenkeeper\/.+/.test(env.CI_COMMIT_REF_NAME),
   uploadBuild: true