Use runuser instead of su, as su does not really support multiple arguments to -c

Fixes #112

Also fixed architecture of Debian packages.

Co-authored-by: nd <nd@cccv.de>

This was forgotten in 45d4598e.

sistason authored 3 years ago and Julian committed 3 years ago

This changes config key "LOGINNAME_BLACKLIST" to "LOGINNAME_BLOCKLIST".