TLS support (#11678)

* implement self signed cert and monitor/reload

* move go2rtc upstream to separate file

* add directory for ACME challenges

* make certsync more resilient

* add TLS docs

* add jwt secret info to docs

docker/main/rootfs/etc/s6-overlay/s6-rc.d/nginx/data/check

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+set -e
+
+# Wait for PID file to exist.
+while ! test -f /run/nginx.pid; do sleep 1; done