RTools path issues / env vars for cmdstanr

[weshinsley]

No description provided.

[codecov]

Codecov Report

Merging #105 (ed81270) into master (25d7104) will not change coverage.
The diff coverage is 100.00%.

❗ Current head ed81270 differs from pull request most recent head 9dcdcae. Consider uploading reports for the commit 9dcdcae to get more accurate results

@@           Coverage Diff           @@
##           master     #105   +/-   ##
=======================================
  Coverage   96.81%   96.81%           
=======================================
  Files          14       14           
  Lines        1194     1194           
=======================================
  Hits         1156     1156           
  Misses         38       38           

Impacted Files	Coverage Δ
R/config.R	100.00% <100.00%> (ø)

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[weshinsley]

For the records https://mrc-ide.myjetbrains.com/youtrack/issue/mrc-3196