intermittent failure of non-interactive GEE access

[brownag]

When knitting the README or vignettes I get intermittent failures. It appears to be related to how the python code is being interpreted, it may also be related to the authorization mode "notebook" vs. "gcloud".

On Windows I get intermittent success, but it essentially always fails on my Manjaro machine.

• Test with older versions of reticulate and earthengine-api
• Look at recursive calls (in e.g. maskedimage $download() method) that may result in C STACK USAGE overflow
• Verify that auth_mode="notebook" is being used as expected; is there some way that Application Default Credentials are persisting even after gcloud auth application-default revoke?