Enhance install script to support Suse Liberty Linux about k3s

[dereknola]

Testing on Liberty 8.9, no issues with the install script were seen. However, additional documentation is needed around setup requirements. SUSE Liberty by default does not include a repo that can provide container-selinux package. Its possible with future releases one will be provided, but for now the workaround is to use Rocky Appstream repo (which is compatible)

# /etc/yum.repos.d/Appstream.repo
[appstream]
name=Rocky Linux $releasever - AppStream
mirrorlist=https://mirrors.rockylinux.org/mirrorlist?arch=$basearch&repo=AppStream-$releasever
#baseurl=http://dl.rockylinux.org/$contentdir/$releasever/AppStream/$basearch/os/
gpgcheck=0
enabled=1

Also, as with other RHEL style Operating Systems, nm-cloud-setup.service needs to be disabled and node rebooted, per our Docs

After that is taken care of, K3s installs just fine

curl -sfL https://get.k3s.io/ | INSTALL_K3S_VERSION=v1.28.9+k3s1 INSTALL_K3S_CHANNEL=testing sh -
...
[INFO]  Installing k3s to /usr/local/bin/k3s
[INFO]  Finding available k3s-selinux versions
Rancher K3s Common (testing)                                                                                                                                           9.3 kB/s | 4.7 kB     00:00    
Dependencies resolved.
=======================================================================================================================================================================================================
 Package                                   Architecture                   Version                                                             Repository                                          Size
=======================================================================================================================================================================================================
Installing:
 k3s-selinux                               noarch                         1.5-2.el8                                                           rancher-k3s-common-testing                          20 k
Installing dependencies:
 container-selinux                         noarch                         2:2.229.0-2.module+el8.10.0+1825+623b0c20                           appstream                                           70 k

Transaction Summary
=======================================================================================================================================================================================================
Install  2 Packages

Total download size: 90 k
Installed size: 161 k
Downloading Packages:
(1/2): container-selinux-2.229.0-2.module+el8.10.0+1825+623b0c20.noarch.rpm                                                                                            404 kB/s |  70 kB     00:00    
(2/2): k3s-selinux-1.5-2.el8.noarch.rpm                                                                                                                                 69 kB/s |  20 kB     00:00    
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                                                                                  214 kB/s |  90 kB     00:00     
Rancher K3s Common (testing)                                                                                                                                           9.2 kB/s | 2.4 kB     00:00    
Importing GPG key 0xD161F542:
 Userid     : "Rancher (CI) <[email protected]>"
 Fingerprint: 856A 0069 529C A63B 21AA 4E0A 089F A20E D161 F542
 From       : https://rpm-testing.rancher.io/public.key
Key imported successfully
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                                                                                                                                                               1/1 
  Running scriptlet: container-selinux-2:2.229.0-2.module+el8.10.0+1825+623b0c20.noarch                                                                                                            1/2 
  Installing       : container-selinux-2:2.229.0-2.module+el8.10.0+1825+623b0c20.noarch                                                                                                            1/2 
  Running scriptlet: container-selinux-2:2.229.0-2.module+el8.10.0+1825+623b0c20.noarch                                                                                                            1/2 
  Running scriptlet: k3s-selinux-1.5-2.el8.noarch                                                                                                                                                  2/2 
  Installing       : k3s-selinux-1.5-2.el8.noarch                                                                                                                                                  2/2 
  Running scriptlet: k3s-selinux-1.5-2.el8.noarch                                                                                                                                                  2/2 
  Running scriptlet: container-selinux-2:2.229.0-2.module+el8.10.0+1825+623b0c20.noarch                                                                                                            2/2 
  Running scriptlet: k3s-selinux-1.5-2.el8.noarch                                                                                                                                                  2/2 
  Verifying        : container-selinux-2:2.229.0-2.module+el8.10.0+1825+623b0c20.noarch                                                                                                            1/2 
  Verifying        : k3s-selinux-1.5-2.el8.noarch                                                                                                                                                  2/2 

Installed:
  container-selinux-2:2.229.0-2.module+el8.10.0+1825+623b0c20.noarch                                                    k3s-selinux-1.5-2.el8.noarch                                                   

Complete!
[INFO]  Creating /usr/local/bin/kubectl symlink to k3s
[INFO]  Creating /usr/local/bin/crictl symlink to k3s
[INFO]  Creating /usr/local/bin/ctr symlink to k3s
[INFO]  Creating killall script /usr/local/bin/k3s-killall.sh
[INFO]  Creating uninstall script /usr/local/bin/k3s-uninstall.sh
[INFO]  env: Creating environment file /etc/systemd/system/k3s.service.env
[INFO]  systemd: Creating service file /etc/systemd/system/k3s.service
[INFO]  systemd: Enabling k3s unit
Created symlink /etc/systemd/system/multi-user.target.wants/k3s.service → /etc/systemd/system/k3s.service.
[INFO]  Host iptables-save/iptables-restore tools not found
[INFO]  Host ip6tables-save/ip6tables-restore tools not found
[INFO]  systemd: Starting k3s