Add version constraint to sidecar / containerbase

[viceice]

What would you like Renovate to be able to do?

We like to constraint our sidecar image, so we can make breaking changes in future and older renovate doen't fail.

If you have any ideas on how this should be implemented, please tell us here.

yes:

1. centralize sidecar image refenrences to single place
2. add constrains

I'll do this in two PR's as the contraints need a lot test changes. So I'll centralize image usage first

Is this a feature you are interested in implementing yourself?

Yes

[viceice]

Additionally we should use /usr/local/buildpack/version to get the containerbase version and validate the version.
So we can ensure a required minimum version