Converting a config file into a conffile

[Stefan Fritsch <sf@sfritsch.de>]

Hi,

I have a package with a config file that is created by postinst, and I 
would like to convert this file into a conffile that is handled by dpkg.

Is there a way to achieve this in a way so that dpkg will silently replace 
the postinst-created default version with the new conffile? I expect that 
normally it will ask the user what to do if I just start shipping a 
conffile.

TIA.

Cheers,
Stefan