rbmi writing files to cache directory during CRAN tests

[gowerc]

rbmi is leaving files in the cache directory when run on CRAN which is causing a note in the CRAN R CMD check logs:

Found the following files/directories:
  ‘~/.cache/R/rbmi/rbmi_MMRM_us_default_999123a8603e2aaf4bc799fe64ecafd9.rds’
  ‘~/.cache/R/rbmi/rbmi_MMRM_us_default_999123a8603e2aaf4bc799fe64ecafd9.stan’
* DONE

Primary cause appears to be due to rbmi writing *.stan files to the cache directory even when rbmi.enable_cache = FALSE. That being said I am confused as to why the *.rds file is still being created as Stan should have autowrite disabled during CRAN tests.

https://www.stats.ox.ac.uk/pub/bdr/donttest/rbmi.out

[gowerc]

From @gravesti 's testing it appears this error can be replicated via the following R CMD check flag:

export _R_CHECK_THINGS_IN_OTHER_DIRS_=true