[Documentation] RPM install

[davidnuzik]

Document the RPM install method. At a minimum we should cover:

• How to do a typical install of the server and agent RPMs
• How to config the service and how to set it to start after reboot (enable it)
• How to uninstall

[davidnuzik]

Some content covered in rancher/docs#2397
Still needs it's own child page in the install section with the requirements outlined in the issue body above.

[davidnuzik]

Depends on finish the RPM based work (main RPM installer for k3s itself, not the SELinux policies).

[Oats87]

As we are not going to be publishing K3s RPMs past the k3s-selinux RPMs, do we still need this @davidnuzik ?

[davidnuzik]

To be discussed with @cjellick

[Oats87]

#2440 has put a nail in the coffin for K3s RPMs (for now)

[davidnuzik]

Closing. RPM artifacts disabled in pipeline. The latest release notes call this out.
Perhaps later we change this and introduce RPMS again, but this is for discussion later. If/when that happens we can open a new docs issue for documenting rpms.

[mysticaltech]

For those in need, this repo works well to install the latest k3s-selinux on latest Fedora 34:

Create /etc/yum.repos.d/rpm-rancher-io.repo and put the following content inside:

[rancher] 
name=Rancher 
baseurl=https://rpm.rancher.io/k3s/stable/common/centos/8/noarch
enabled=1 
gpgcheck=1 
gpgkey=https://rpm.rancher.io/public.key