Add Upstart job for met-api prototype

Summary: Refs T236. Adds an Upstart job for met-api. Things are a little plastered at the moment, as we don't have a clear deployment strategy. I could add some support in the cookbook for building the software, but would it be useful?

Test Plan: Run `kitchen test`

Reviewers: martinp, havardf

Reviewed By: havardf

Subscribers: michaeloa

Projects: #continuous_deployment_for_bora

Maniphest Tasks: T236

Differential Revision: https://phab.met.no/D93