Zet File Parsing non-Isosec bug

[danielmichaels]

Parsing directories ignores any non-isosec files

This fixes issues where the zet repo has directories or files which are not isosec dirs. For instance, a README.md in the zet root would cause the app to fail.

The fix includes running a regex over the list of files

const zetRegex = "^[0-9]{14,}$"

r := regexp.MustCompile(zetRegex)
	// trunc most of the implementation

	for _, f := range fileInfo {
		if !r.MatchString(f.Name()) {
			continue
		}
	}
	return files, nil