Add a section on how to create a fips compliant image from scratch

[jimmykarily]

Completes kairos-io/kairos#361

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[jimmykarily]

It would be nice to have some instructions on how to build other framework images (for non-ubuntu flavors) but it's not very streamlined yet on our side. I don't want to write documentation that explains how to replicate our Earthly targets.

[mauromorales]

informative looks good to me, but would it make sense to have an example of how pointing to the specific package looks like? or is the user to be savvy enough regarding packages at this point? I ask because I'd be a bit confused how to do it myself

[jimmykarily]

informative looks good to me, but would it make sense to have an example of how pointing to the specific package looks like? or is the user to be savvy enough regarding packages at this point? I ask because I'd be a bit confused how to do it myself

Yes I know. The only easy flow there is, is partly described in the document:

• Build a Dockefile with your Ubuntu OS
• Copy things from our ubuntu fips framework image
• Done (kinda)

Of course then, they will face the issue with the missing values in /etc/os-release (kairos-io/kairos#1548). Also they have to figure out how to build a fips enabled Ubuntu Dockerfile.

And this is the "happy path". There is no framework image for non-Ubuntu flavors in which case, they would need to replicate the result of our Earthly targets to build one.

We could write instructions on how to complete these tasks. I don't think doing so will make it much easier though. In my opinion, we should make it more streamlined first and then document it more.