When running Hail locally, how do I set the Spark local directory (scratch space) to something other than the default `/tmp`?

I cannot use my /tmp directory because it has too little space. Also, I think the file system sometimes cleans that directory while hail is running!

Set this environment variable with

export SPARK_LOCAL_DIRS=/path/to/myTmp

before running Hail. The user running hail must have write permission to this directory.