Docker Hub build notifications for Slack

A tiny Sinatra app that receives webhooks from Docker Hub and re-posts them as Slack formatted hooks.

Setup

1. Generate an incoming webhook in the Slack integration settings e.g. https://hooks.slack.com/services/<your-service-tag…>
2. Create a new webhook on Docker Hub with pointing to this url. e.g. https://<your-heroku-subdomain>.herokuapp.com/services/<your-service-tag…>