Support for customisation of built images

[pbronneberg]

We're assessing a use-case of customisation of images built by Edge Image Builder.
Creating this ticket as a feature request / place-holder (also discussing this with @rdoxenham)

Example use-cases

A "platform team" builds, tests, releases and maintains "platform" Edge images, containing base packages, containers and hardened configuration.

"Product teams" regularly take in new versions of this base-image, and add product specifics.
Examples:

• Add network configuration
• Add OS packages (e.g. GPU driver)
• Add product specific container images & helm charts

The development team could also take in the base platform image, and add:

• Users / groups for development purposes

Solution direction

Potential solutions could be:

• Edge image builder inception - Use EIB to customize EIB built ISO's
• Allow to provide override configuration (equivalent to ignition config on a separate partition)