Merge #1221

1221: Dovecot: Delete obsolete data volume r=mergify[bot] a=muhlemmer

## What type of PR?

Enhancement

## What does this PR do?

The /data volume was used in the past for Dovecot to access the main.db SQLite file. This is no longer the case and the volume has become obsolete.

## Prerequistes
Before we can consider review and merge, please make sure the following list is done and checked.
If an entry in not applicable, you can check it or remove it from the list.

- [x] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/guide.html#changelog) entry file.


Co-authored-by: Tim Möhlmann <muhlemmer@gmail.com>

core/dovecot/Dockerfile

@@ -19,7 +19,7 @@ COPY conf /conf
 COPY start.py /start.py
 
 EXPOSE 110/tcp 143/tcp 993/tcp 4190/tcp 2525/tcp
-VOLUME ["/data", "/mail"]
+VOLUME ["/mail"]
 
 CMD /start.py
 

towncrier/newsfragments/1221.removal

@@ -0,0 +1 @@
+Dovecot: Delete obsolete data volume