Feature: First class support for multiple CI providers

[YOU54F]

Who would you want to see?

Bear in mind we need to consider

• the available env vars that give us info about the project
• the location where build artefacts are stored
• where the build reports are stored

also people may want to serve up their assets from else where, but we still need access to the test report, to work out what type of message we need to send (build failed/tests passed/tests failed)