message: Keep installing binary packages on Windows
diff: +local({
  + pkg <- c("DBI", "callr", "DBItest", "dbplyr", "nycflights13", "testthat", "bit64", "cpp11", "arrow", "covr"),
  +
  + if (.Platform$OS.type == "unix") {
  options(HTTPUserAgent = sprintf("R/4.1.0 R (4.1.0 %s)", paste(R.version$platform, R.version$arch, R.version$os)))
  -install.packages(
  - c("DBI", "callr", "DBItest", "dbplyr", "nycflights13", "testthat", "bit64", "cpp11", "arrow", "covr"),
  - repos = "https://packagemanager.rstudio.com/all/__linux__/focal/latest"
  -)
  + install.packages(pkg, repos = "https://packagemanager.rstudio.com/all/__linux__/focal/latest")
  + } else {
  + install.packages(pkg, repos = "https://cloud.r-project.org", pkgType = "binary")
  + }
  +})
  