Deployment Modes files to sync

[pturmel]

See the technique Kevin describes here:

Disable devices in Gateway Startup Script (v8.3.0)

Setting the deployment mode via an environment variable is not yet supported, you've got to supply the Java system property via a JVM argument, -Dignition.config.mode=yourdeploymentmode. As @paul-griffith mentions, we're going to be doing additional refinements in this area. However, I've got some guidance that might be useful in the meantime. Currently, at time of writing w/ 8.3.0, if you add the deployment mode arg explicitly to your data/ignition.conf, it will be within any gateway backup …