UCore stable kernel & prebuilt ZFS packages + Sanoid

- Kernel RPMs from ghcr.io/ublue-os/coreos-stable-kernel image
- Matching ZFS RPMs from ghcr.io/ublue-os/akmods-zfs image
- Sanoid installed from gregw-extras-fedora-40 COPR
- Remove RPM firefox

README.md

@@ -7,15 +7,9 @@ This is a customized Universal Blue image with the OpenZFS kernel module install
 See [upstream Universal Blue](https://github.com/ublue-os/main/) repo for more detailed instructions how
 to rebase to this image.
 
-The ZFS modules are built against the latest latest ublue-os:main image, Fedora 40 at the time of writing.
+Image uses CoreOS' `stable` kernel from [Universal Blue kernel-cache image](https://ghcr.io/ublue-os/coreos-stable-kernel) and
-Building the modules is basically taken straight from [Fedora CoreOS](https://github.com/coreos/layering-examples/tree/main/build-zfs-module)
+matching ZFS kmod RPMs from [Universal Blue `akmods-zfs` image](https://ghcr.io/ublue-os/akmods-zfs) are installed.
-example, except the base image used to detect the correct kernel version to build against is `ublue-os:main`.
 
-## Known issues
+Other additions, subject to change:
-The build fails consistently once a week. Most likely Fedora repos are already serving a newer kernel version,
+- RPM firefox removed
-while the pulled ublue image is still on the older kernel version. Next day's build succeeds, so this only means
+- Sanoid installed from [gregw/extras COPR](https://copr.fedorainfracloud.org/coprs/gregw/extras)
-a day without an updated image every week.
-
-Dependencies for Jim Salter's excellent [Sanoid/Syncoid](https://github.com/jimsalterjrs/sanoid) might become
-preinstalled at some stage, but for now I've decided to keep everything close to `ublue-os:main`. Suggestions,
-issues and pull requests are welcome.