docker: dconf errors being thrown

[rdmark]

The following errors get thrown when launching the Alpine based 3.2.1 docker container.

I don't think dconf is needed in the container, so this is to look into whether it can be purged.

netatalk-1  | (process:66): dconf-CRITICAL **: 06:16:55.354: unable to create file '/usr/var/netatalk/dconf/user': Permission denied.  dconf will not work properly.
netatalk-1  | 
netatalk-1  | (process:66): dconf-CRITICAL **: 06:16:55.354: unable to create file '/usr/var/netatalk/dconf/user': Permission denied.  dconf will not work properly.
netatalk-1  | 
netatalk-1  | (process:66): dconf-CRITICAL **: 06:16:55.354: unable to create file '/usr/var/netatalk/dconf/user': Permission denied.  dconf will not work properly.
netatalk-1  | 
netatalk-1  | (process:66): dconf-CRITICAL **: 06:16:55.354: unable to create file '/usr/var/netatalk/dconf/user': Permission denied.  dconf will not work properly.
netatalk-1  | 
netatalk-1  | (process:66): dconf-CRITICAL **: 06:16:55.354: unable to create file '/usr/var/netatalk/dconf/user': Permission denied.  dconf will not work properly.
netatalk-1  | 
netatalk-1  | (process:66): dconf-CRITICAL **: 06:16:55.354: unable to create file '/usr/var/netatalk/dconf/user': Permission denied.  dconf will not work properly.
netatalk-1  | 
netatalk-1  | (process:66): dconf-CRITICAL **: 06:16:55.354: unable to create file '/usr/var/netatalk/dconf/user': Permission denied.  dconf will not work properly.
netatalk-1  | 
netatalk-1  | (process:66): dconf-CRITICAL **: 06:16:55.356: unable to create file '/usr/var/netatalk/dconf/user': Permission denied.  dconf will not work properly.