message: Use RStudio Package Manager for faster installs
diff: -install.packages(c("DBI", "callr", "DBItest", "dbplyr", "nycflights13", "testthat", "bit64", "cpp11","arrow"), repos="https://cloud.r-project.org/", type="source", Ncpus=parallel::detectCores())
  +options(HTTPUserAgent = sprintf("R/%s R (%s)", getRversion(), paste(getRversion(), R.version$platform, R.version$arch, R.version$os))
  +install.packages(
  + c("DBI", "callr", "DBItest", "dbplyr", "nycflights13", "testthat", "bit64", "cpp11", "arrow"),
  + repos = "https://packagemanager.rstudio.com/all/__linux__/focal/latest"
  +)
  