Fix needed: Add parameter for R version

[TBarry95]

Hey, looks like theres an issue with shinyapps.io not having the latest R version. See thread here: https://forum.posit.co/t/unsuported-r-verion-4-4-1-on-shinyapps-io/188270

I think fix would be to expose R version parameter to be provided.

Log error below:

─ Deploying to server ─────────────────────────────────────────────────────────
Waiting for task: 1428956464
error: Building image: 10665872

Begin Task Log

End Task Log

Error: Unhandled Exception: child_task=1428956466 child_task_status=error: Unhandled Exception: Unsupported R version 4.4.1 for operating system jammy.
Execution halted