[CUPS] Rewrite based on @zajac-grzegorz work (#218)

* [CUPS] Rewrite based on @zajac-grzegorz work

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

cups/rootfs/etc/s6-overlay/s6-rc.d/cups-server/run

@@ -0,0 +1,12 @@
+#!/usr/bin/with-contenv bashio
+
+ulimit -n 1048576
+
+bashio::log.info "Starting CUPS server from S6"
+
+until [ -e /var/run/avahi-daemon/socket ]; do
+  sleep 1s
+done
+
+cupsd -f
+