RPMs build workflows

[mskarbek]

I took some time and created workflows to build RPMs for Fedora, RHEL and AlmaLinux: https://github.com/zeet-cc/zfs-rpms
Currently, RPMs are published as assets on Releases page of that repo. Making RPM repo from that is easy.
Workflow is extremely simple - just commit OpenZFS/Kernel version for desired distribution in appropriate file.
RHEL builds are using my Developer Subscription.
Fedora builds are using Kernel packages downloaded directly from Koji. That way, it's possible to provide kmod packages build before Kernel packages are published in Fedora updates repo by automatically follow Koji events related to the new Kernel builds.

Similar solution could be added for CentOS Stream 8 and 9.

This could help with issues like #12747.

Fedora 35 workflow is "disabled" due to the Python 3.10 issue.

[mskarbek]

If somebody wonders what exactly is zfs-contaier package - it's my dummy for zfs-kmod that allows me to install and use OpenZFS userspace tools inside containers without dragging in full Kernel packages set.

[mskarbek]

Following Slack discussion with @problame I have added an extra meta package for Fedora - kernel-zfswhich will tightly couple zfs-kmod and kernel-core packages, preventing installation of newer Kernels without corresponding zfs-kmod packages. It's completely optional but will help avoid problems with simply overlooking dnf update information about update scope.