Default docker image from packer does not create healthcheck file, causing the /healthcheck endpoint to 404

The `latest` (`0.0.14`) docker image hosted on `quay.io` does not have the `/tmp/status` file as declared in `iris/configs/config.dev.yaml`.

It seems all that is needed is the (1) creation of this file and (2) filling this file with the desired response of the `/healthcheck` endpoint (based on the documentation, `GOOD`).

Start with iris/configs/config.dev.yaml and the default Docker image definition used by packer, then compare the declared /tmp/status path with the image contents. Done means the image creates /tmp/status with the documented GOOD response and the /healthcheck endpoint no longer returns 404.

Written by the indexing model from the issue text.