Improve the auto-deployment to manage sys deps of R packages

[NeuroShepherd]

Can use {pak} to detect these at minimum, and potentially to install

E.g. could run renv::dependencies() to get a list of deps in the project, and then use the vector of package names either to make a list of packages to be installed first with pak so that the system deps are installed, or follow some other approach

[NeuroShepherd]

Some playing around

pak::pkg_system_requirements("gitcreds")

pak::pkg_sysreqs("gitcreds")

pak::sysreqs_platforms()

pak::install

pak::pkg_sysreqs(c("curl", "xml2", "devtools", "CHRONOS"))