[WIP] Touch a worker.started file after worker initialization

[agrare]

Currently when workers are running under Systemd we use SD_NOTIFY to signal that a worker has started, Kubernetes also has a "startup probe" which waits for an indication that the worker is started before starting the readiness probe.

We can touch a startup file that a k8s startup probe can check when we mark the worker as "STARTED"

[agrare]

@jrafanie where are you eager loading the API constants? Want to ensure it is before this

[miq-bot]

Checked commit https://github.com/agrare/manageiq/commit/131aefbcc772f887d011e1c2e63dd38c9cf51e86 with ruby 2.6.7, rubocop 1.19.1, haml-lint 0.35.0, and yamllint 4 files checked, 1 offense detected

lib/container_orchestrator/object_definition.rb

• [ ] :exclamation: - Line 113, Col 56 - Rails/FilePath - Prefer Rails.root.join('path/to').

[miq-bot]

This pull request is not mergeable. Please rebase and repush.

[agrare]

Going to close this as we don't currently have a requirement for it