structure is now:

> s3 --no-sign-request ls <s3://annotation-cache/snpeff_cache/>
                           PRE GRCh38.105/
                           PRE WBcel235.105/

aws s3 --no-sign-request ls <s3://annotation-cache/snpeff_cache/GRCh38.105/>
                           PRE GRCh38.105/

Basically just adding one extra folder with the same key, that is easy to figure out, since it's what we provide to snpeff and vep when we build.