Add master build list endpoint for wall

[scottferg]

@bradrydzewski this adds a top level build list (similar to what we added to v3) that is necessary for drone-wall to operate.

[CLAassistant]

All committers have accepted the CLA.

[bradrydzewski]

@scottferg I think you can use the existing /api/user/feed endpoint for this. It should be the same thing we have in 0.3 but altered for use with 0.4

you'll just need to make sure the token used to query the feed is generated from an account that has access to all your repos (ideally an organization admin).

the only reason I suggest this (/api/user/feed) is that a larger drone installation may be used across multiple github enterprise organization, and have multiple drone walls with the repos specific to their organization. But let me know your thoughts!

[scottferg]

Yup! Totally can. Serves me right for not reading the docs.

[bradrydzewski]

actually, it isn't in the docs :)

... so you can blame me

[bradrydzewski]

for reference, the reason this wasn't documented was I didn't want to advertise the endpoint until it was benchmarked in case it needed to be removed or tweaked. The benchmark was positive (you can see at #1234) so you should be good to rely on this endpoint going forward.

[scottferg]

Ha cool. I don't feel like as big of an idiot. This will make getting the wall up to snuff much easier either way.