Add config option for ipv6 usage (#312)

* add allow_ipv6 config option

* add ipv6 config changes to cmdeploy

* fix name of config option for ipv6 in config.py

* move configure ipv6 before service start

* Use templates for disabling ipv6

* lint

* fix parameters in _configure_dovecot

* dont pass domain to _configure_nginx

* make disable_ipv6 boolean

Co-authored-by: missytake <missytake@systemli.org>

* implement namis suggestions reg boolean for ipv6

* Update chatmaild/src/chatmaild/config.py

Co-authored-by: missytake <missytake@systemli.org>

* ruff

* ruff again :)

* fix merge conflict

* CI: add CI machine with IPv6 disabled

* CI: fix sed statement

* CI: fix ubuntu reset

* CI: separate cert storage for staging2 and staging-ipv4

* add DNS records to proper zone

* CI: ignore if folders are missing

* CI: renames are not needed like this

* CI: fix default DNS zone for ipv4

* CI: use debian 12 instead of ubuntu, tired of trying to guess the correct image

* remove duplicared listen on 8443

* use jinja templates for disable_ipv6

* remove unused variable

* add missing % sign in jinja tempalte

* more fun with jinja syntax

* CI: proper rsync paths for acme & DKIM caching

* Changelog: add disable_ipv6 config option

---------

Co-authored-by: missytake <missytake@systemli.org>
Co-authored-by: holger krekel <holger@merlinux.eu>

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## untagged
 
+- Add `disable_ipv6` config option to chatmail.ini.
+  Required if the server doesn't have IPv6 connectivity.
+  ([#312](https://github.com/deltachat/chatmail/pull/312))
+
 - allow current K9/Thunderbird-mail releases to send encrypted messages
   outside by accepting their localized "encrypted subject" strings. 
   ([#370](https://github.com/deltachat/chatmail/pull/370))