Remove debugging
Fix memory/fd leak with pkg repo signing_command
Fix crash when pkg repo rsa-key fails

  INTERNAL ERROR: Function archive_write_close invoked with invalid struct archive structure.
  zsh: abort (core dumped)
Delete temporary txz if pkg repo rsa-key fails
Document pkg-repo signing options and add EXAMPLES
pkg-repo: Return EX_DATAERR if a problem is encountered during packing