User Story

As a operator I would like to build provider docker but have owns docker registry and some registry specifics, i.e. .netrc mounting for registry credentials propagation. To meet all the targets, I have to fix the files every time, instead of just setting the build parameters in CI.

Detailed Description

For this case, I would like to customize docker file and Makefile options, to be fully customizable. It would be nice to collect build options in one place, i.e. Makefile parameters to reduce maintenance difficulty for third-party builders and community as well.

/kind feature