Fix history and status syncronization in jabber rooms

See merge request !177

See: https://prosody.im/doc/modules/mod_muc_mam

Torniamo a `xmpp` come nome del servizio prosody

See merge request !167

The bind mount of the socket itself is not going to survive a
restart of the auth-server (UNIX sockets are deleted and re-
created on start).

Further xmpp cleanup

See merge request !176

Add metric for postfix SMTP bounces

See merge request !175

This reverts commit cdac3444.

new postfix transport map with host based rules

See merge request !174

Part of cleanup issue #6.

Enable Prosody mod_prometheus

See merge request !173

Remove seclabels

See merge request !172

The /run/prosody directory does not exist inside our container,
just use /run.

Prevents Gitlab from skipping the stop job if the run stage fails.

Use separate deploy / run stages in CI scripts

See merge request !170

The git metadata of testbed is particularly huge, this should reduce
the size of the generated artifact.

When the postfix_out_inet_protocols variable is set, do the
override properly instead of duplicating the directive (which
generates a lot of warnings).

This should allow Gitlab to better understand failure of the Ansible
side of things, by having the environment setup ("deploy") job succeed
early.

Add Pan.do/ra service

See merge request !162

Remove autogeneration of static_mail_domains data

See merge request !168