Return plans built by a GitHub hook in response
Return plans built by a GitHub hook in response

Add a response body to `/notify` which communicates back to GitHub
which plans were scheduled for a build. This helps with debugging
and cataloguing in the GitHub App hook payload view.

Signed-off-by: Jamie Winsor <b4dde37aa2aac745c0e6c43447507eaeace3e59f@vialstudios.com>

rsertelon/habitat,rsertelon/habitat,rsertelon/habitat,habitat-sh/habitat,habitat-sh/habitat,rsertelon/habitat,habitat-sh/habitat,habitat-sh/habitat,habitat-sh/habitat,rsertelon/habitat,rsertelon/habitat,habitat-sh/habitat,habitat-sh/habitat,rsertelon/habitat,habitat-sh/habitat