* fix: Fixes let's encrypt for latest ubuntu versions.

* squash: Simplifies the logic.

* fix: Fixes Let's Encrypt script.

It fails when certbot is not installed and exits with an error without installing anything.

* squash: Fixes certbot command after install.

This introduces a variable which holds the path to the detected `certbot`
binary and reuses that to fix the inconsistency which arose from looking for
`certbot` but then later using the hardcoded path `/usr/bin/certbot` in
invocations. This broke snap installations of certbot.

Fixes: https://github.com/jitsi/jitsi-meet/issues/11072

Co-authored-by: Oliver Schneider <oliver@assarbad.net>

* add systemd to letsencrypt

* Better readability of systemd change

Co-authored-by: Sebastian Feustel <sebastian.feustel@aei.mpg.de>

* debian: Update coturn udp port to non-privileged one.

* debian: Turnserver config requires jitsi-meet-web-config files.

* doc: Updates doc, removing `--no-install-recommends`.

* debian: Moves checks and configs to default to prosody 0.11.

* debian: Disable room locking on internal muc.

* add scripts for deploying coturn with certbot

* turnserver: Removes unused variable showing error.

* debian: updates let's encrypt and coturn scripts.

* debian: Detect failure to retrieve external ip address.

* debian: Always configure turn when the turnserver package is installed.

Co-authored-by: Julien Fastré <julien.fastre@champs-libres.coop>

Update install-letsencrypt-cert.sh to fix missing cron.weekly
REFS : https://github.com/jitsi/jitsi-meet/issues/5576

* Adds package that can configure using turnserver for jitsi-meet.

Activates http2 on the nginx host and uses the alpn send with the web requests to multiplex traffic to be served as web of proxied to the turn server.
It needs nginx at least v1.13.10.
Adds turncredentials module from Philipp Hancke, with small modification (all int values for hosts need to be strings/tostring()) in order to be able to use the module with prosody 0.11.

* Moves loading of stream after loading stream module (50-..).

* Leaves DISABLE_TCP_HARVESTER to be handled by jvb.

* Fixes comments.

* Properly detect first time coturn install and configure it.

* Handles upgrading from jetty serving web.

* Does not create jvb user if already exists.

* Fixes let's encrypt and adds turnserver handling.

* Enables use of turn server in config.js if available.

* Adds a check whether prosody config exists.

There are cases where deployments can still have configured prosody in the main prosody config in /etc/prosody.

The script looks for nginx, apache2 or jetty configuration and edits the first one found. Nginx and apache2 will be reloaded, while jvb will be stopped, configured and started again.