[FEATURE] Use Copier to keep formulas up-to-date with template development automatically

[ypid-geberit]

Is your feature request related to a problem?

This template can only be instantiated once. Both the template and the instantiated formula will develop. It should be easy for formula maintainers to keep their formulas up to the latest standards.

Describe the solution you'd like

Copier is the only project template program I know that can not only generate the initial project, but using git history update the project with the diff from the template.

Describe alternatives you've considered

Additional context

[baby-gnu]

Hello.

@myii has a tool to update formulas managed by the workgroup.

We may provide something for people how want to manage their own formulas outside the workgroup.

[daks]

I don't know about Copier but it could be a nice idea, I also find it difficult to keep a formula up to date.

In fact ssf-formula is used to maintain all saltstack-formulas but it is quite specific to this usage, it does a lot of things and it's quite difficult to understand what it does and how :)