Add healthcheck for go2rtc service (#5545)

* Upgrade s6-overlay from 3.1.3.0 to 3.1.4.0

* Add go2rtc healthcheck service

Also don't make go2rtc exits cause the container to fail.

* Reword healthcheck message

Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>

* Add timeout to go2rtc healthcheck

* Update healthcheck message

Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>

* Give additional time for go2rtc start/restart

* Fix typo

* Avoid creating go2rtc config multiple times

* Fix healthcheck not starting

* Fix sleep

* Fix more hidden logs

* Decrease time window and use curl's timeout flag

---------

Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>

docker/install_s6_overlay.sh

@@ -2,7 +2,7 @@
 
 set -euxo pipefail
 
-s6_version="3.1.3.0"
+s6_version="3.1.4.0"
 
 if [[ "${TARGETARCH}" == "amd64" ]]; then
     s6_arch="x86_64"