refs https://github.com/TryGhost/Ghost/issues/12496
- Handling logging in the main thread avoids file handle leaks which happen due to leaky implementation of bunyan logger (see referenced issue for more context)
- Bumped job-manager version to allow for `workerMessageHandler` callback funciton
refs https://github.com/TryGhost/Ghost-Utils/issues/118
- Duplicating error handling across jobs is not best developer experience. Also, having custom error handling logic did not allow for recommended worker script behavior: allowing for unhandled exceptions to bubble up and be managed by parent process
- Bottom line - we need to manage shutting down gracefully when doing long-running tasks
- To achieve that, we're going to use job queues
In this commit:
- added new @tryghost/job-manager dependency
- added a minimal job service, that handles in passing things like logging and (maybe later) config
- job service is wired up to server shutdown, so that the queue finishes before the server exits
- also added a new job endpoint to testmode so that it's easy to test job behaviour without needing to do real work
