Dockerfiles for R plumber APIs

These images are a stable and convenient base for R APIs.

plumber-base

• Built on the most stable R image, rocker/r-rev
• Contains plumber and a minimal tidyverse
• Contains convenience (and IMO best practice) tools like logging and config

plumber-mysql

• Built on plumber-base for robustness
• Adds system libraries and R packages necessary to connect to MySQL databases
• NOTE: relies on RMariaDB instead of the legacy RMySQL package!