There are tutorials covering the deployment of Ruby and Python apps but I can\'t find good documentation or examples for NodeJS.
http://docs.gitlab.com/ce/ci/examples/t
I have found a detailed article for continuous integration on Heroku:
https://medium.com/@seulkiro/deploy-node-js-app-with-gitlab-ci-cd-214d12bfeeb5
Sample .gitlab-ci.yml file :
https://gitlab.com/seulkiro/node-heroku-dpl