Mailserver 1.1

New features

• Monitoring: basic host system metrics on "home" dashboard. CPU load, memory load, and disk space usage are shown.
• DNS checker: improved reporting. Updates are now only pushed on change, lowering pressure on pushgateway and promentheus.
• supervisord integration to restart in-container services on issues. Also allows cleaner shutdown.

Bug fixes

• Release VERSION file generation fixed.
• contrib/mailman: remove unnecessary TCP port exports, exclude monitoring/ from mailman basic-auth
• entry.sh: append to logs instead of overwriting logs on restart