fix(mok): Add missing persistentence for sieve data

This patch fixes the absense of persistence for sieve rules, due to
being layed out in parallel to the `/srv/mail/mailbox` directory in the
dovecot container.

By moving the mountpoint to `/var/mail` the sieve rules should be
persisted along the way with the mailboxes.

BREAKING CHANGE: This patch adjusts the mount location for mail data,
which will require manual interaction.

charts/mok/Chart.yaml

@@ -3,7 +3,7 @@ name: mok
 description: |
   Mail on Kubernetes (MoK) is a project to deploy a functional mailserver that runs without a database server on Kubernetes, taking advantage of configmaps and secret.
 type: application
-version: 0.4.3
+version: 0.5.0 
 sources:
   - https://de.postfix.org/ftpmirror/index.html
   - https://github.com/dovecot/core

charts/mok/README.md

 # mok
 
-![Version: 0.4.3](https://img.shields.io/badge/Version-0.4.3-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square)
+![Version: 0.5.0](https://img.shields.io/badge/Version-0.5.0-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square)
 
 Mail on Kubernetes (MoK) is a project to deploy a functional mailserver that runs without a database server on Kubernetes, taking advantage of configmaps and secret.
 

charts/mok/templates/dovecot.yaml

@@ -110,7 +110,7 @@ spec:
             {{- toYaml .Values.dovecot.securityContext | nindent 12 }}
           volumeMounts:
             - name: vmail
-              mountPath: /srv/mail/mailboxes/
+              mountPath: /srv/mail/
             - name: users
               mountPath: "/srv/passdb/"
               readOnly: true