Add install-zfs-dkms-module example

[twiest]

Add install-zfs-dkms-module example

• Add install-zfs-dkms-module example Containerfile and readme
• Add install-zfs-dkms-module example to main readme
• Add install-zfs-dkms-module github workflow file
• Test build install-zfs-dkms-module example

[twiest]

Looks like this is failing because fedora-cores stable has kernel version 6.4.7 and the ZFS package requires a maximum kernel version of 6.3.999.

ZFS does this on purpose because the kernel symbols can change and they have to ensure that they work with each version of the kernel.

This will automatically start working once the ZFS package is updated to allow for kernel 6.4.x.

Until then, I'm going to mark this as a draft PR.

[jmarrero]

Nice, this is a lot simpler than building the module zfs from scratch like we did for: https://github.com/coreos/layering-examples/blob/main/build-zfs-module/Containerfile.

[jmarrero]

I guess we only run CI when someone changes the example, so merging this would not throw a bunch of failures at us every time fedora updates the kernel to a version not supported by ZFS.

[andrewgdunn]

This works now with the recent release from the upstream zfs project. Thanks for the awesome example.

[jmarrero]

@twiest anything new and cool you have done to your Containerfile that you want to update here before I merge it?