This buildpack is an inline buildpack (tldr: this repo deploys to Heroku and uses itself as a buildpack) for deploying Mattermost to Heroku. It must used in tandem with This customized Nginx Buildpack.
Mattermost is not a 12 factor compatible app, so the startup script writes your Heroku environment variables to a config file when the dyno starts.
MATTERMOST_VERSION to the release version you'd like to install. i.e. '3.4.0'
MATTERMOST_TYPE to either 'team' or 'enterprise'
Mattermost-Heroku supports every config option that Mattermost 3.4 defines. You can see the mapping between Mattermost config settings and Heroku environment variables in the configuration template.
Use the deploy menu on the Heroku dashboard to trigger manual deploys.
Activate it as instructed in the docs https://docs.mattermost.com/install/ee-install.html
Copy the snippet above into CLI.