Resolve Rubocop violations
Fix off-by-one in array index triggered when no file upload succeeds
Fix cleanup: ensure files are removed when upload succeeds but execution fails
Add AutoCheck
Add module notes
Add error handling and associated operator feedback
Add additional writable paths required for some old Nagios versions
Add fallback to session as `apache` if privlege escalation fails
Update documentation in line with above changes and fix software download links
Brendan Coles