ShinyProxy cronjobs

Hi there,

Perhaps an interesting suggestion for ShinyProxy might be support for cronjobs. For example, when frequently sending emails, the ShinyProxy architecture (there may not always be a pod running a Shiny application) requires a setup that has to be created outside of a Shiny application.

While it is not a whole lot of work to build a docker container and deploy it to Kubernetes for example, the main reason I see for including cronjobs in ShinyProxy is that one could reuse container-env-file: /path/to/env-file.

Best regards,