there is some issue in binding all of etc /etc (which this image does)
and so we dropped it. only we need all of /etc so this re-enables it.
the isse is fixed if we set HOME=SINGULARITY_HOME so users in tutorials
and classes can create a ~/.rstudio directory (which before wouldn't work
because HOME was still being evaluated as the actual home which didn't
exist in the container).
there is some issue in binding all of etc /etc (which this image does) and so we dropped it. only we need all of /etc so this re-enables it. the isse is fixed if we set HOME=SINGULARITY_HOME so users in tutorials and classes can create a ~/.rstudio directory (which before wouldn't work because HOME was still being evaluated as the actual home which didn't exist in the container).