message: fallback arrow install
diff: -install.packages(c("DBI", "callr", "DBItest", "dbplyr", "nycflights13", "testthat", "bit64", "cpp11"), repos="https://cloud.r-project.org/", type="source")
  +install.packages(c("DBI", "callr", "DBItest", "dbplyr", "nycflights13", "testthat", "bit64", "cpp11", "arrow"), repos="https://cloud.r-project.org/", type="source")
  install.packages("arrow", repos = "https://arrow-r-nightly.s3.amazonaws.com")
  