Feature/oracle linux11 (#532)

* fix: handle Oracle Linux UEK kernel package name for br_netfilter

Oracle Linux uses the Unbreakable Enterprise Kernel (UEK) instead of the
standard RHEL kernel. The `kernel-modules-extra` package does not exist
on Oracle Linux — the equivalent is `kernel-uek-modules-extra`.

Without this fix, the prereq role fails on Oracle Linux 10 with:
  "No package kernel-modules-extra available."

Signed-off-by: Helmut Wolf <3902045+shadow1runner@users.noreply.github.com>

* chore: update README to include Oracle Linux

Signed-off-by: Helmut Wolf <3902045+shadow1runner@users.noreply.github.com>

---------

Signed-off-by: Helmut Wolf <3902045+shadow1runner@users.noreply.github.com>
Co-authored-by: Helmut Wolf <3902045+shadow1runner@users.noreply.github.com>

README.md

@@ -8,7 +8,7 @@ Easily bring up a cluster on machines running:
 - [X] Debian
 - [X] Ubuntu
 - [X] Raspberry Pi OS
-- [X] RHEL Family (CentOS, Redhat, Rocky Linux...)
+- [X] RHEL Family (CentOS, Redhat, Rocky Linux, Oracle Linux...)
 - [X] SUSE Family (SLES, OpenSUSE Leap, Tumbleweed...)
 - [X] ArchLinux