feature: store jenkins job info

[jbergstroem]

The bot currently have an endpoint that jenkins notifies on every build start/end. Since the bot is additionally moving into reading .tap files and likely more build info (to visualize failed tests at GH, etc), it would make sense to poll and store build data. This would make us able to create a separate frontend that can display a full build history instead of the 20 days we currently offer through github. Linking to this will make old issues/pr's not bit-rot.

[maclover7]

Available via https://nodejs-ci-health.mmarchini.me/

[joyeecheung]

@maclover7 I think that website only display results of the last 100 jobs?

[maclover7]

@joyeecheung Ah, yeah, I guess that's true. If anybody wants to take this up then please feel free to reopen, though we'd have to figure out hosting for a database

[joyeecheung]

I think someone mentioned that we could use a free tier of mongodb at the collaboration summit, but I totally forgot who that was. Anyways that probably deserve a second issue with a more concrete plan.