The error returned from "os/exec".Command when attempting to execute a
directory has been changed from syscall.EACCESS to syscall.EISDIR on
Go 1.20. 2b8f214094
Consequently, any runc runtime built against Go 1.20 will return an
error containing 'is a directory' and not 'permission denied'. Update
the string matching so the CLI exits with status code 126 on 'is a
directory' errors (EISDIR) in addition to 'permission denied' (EACCESS).
Signed-off-by: Cory Snider <csnider@mirantis.com>