r is installed by default on GHA

testing/get-r.ps1

@@ -1,6 +0,0 @@
-$dir = $Env:Temp
-$urlR = "https://cran.r-project.org/bin/windows/base/old/4.0.4/R-4.0.4-win.exe"
-$outputR = "$dir\R-win.exe"
-$wcR = New-Object System.Net.WebClient
-$wcR.DownloadFile($urlR, $outputR)
-Start-Process -FilePath $outputR -ArgumentList "/S /v/qn"

testing/get-r.sh

@@ -1,9 +0,0 @@
-#!/usr/bin/env bash
-sudo apt install r-base
-# create empty folder for user library.
-# necessary for non-root users who have
-# never installed an R package before.
-# Alternatively, we require the renv
-# package to be installed already, then we can
-# omit that.
-Rscript -e 'dir.create(Sys.getenv("R_LIBS_USER"), recursive = TRUE)'