Add KVM hypervisor playbook to contrib

Optional Ansible playbook for preparing a host for running Kargo.
This includes creation of a user account, some basic packages,
and sysctl values required to allow CNI networking on a libvirt network.

contrib/kvm-setup/roles/kvm-setup/tasks/main.yml

@@ -0,0 +1,46 @@
+---
+
+- name: Upgrade all packages to the latest version (yum)
+  yum:
+   name: '*'
+   state: latest
+  when: ansible_os_family == "RedHat"
+
+- name: Install required packages
+  yum:
+    name: "{{ item }}"
+    state: latest
+  with_items:
+    - bind-utils
+    - ntp
+  when: ansible_os_family == "RedHat"
+
+- name: Install required packages
+  apt:
+    upgrade: yes
+    update_cache: yes
+    cache_valid_time: 3600
+    name: "{{ item }}"
+    state: latest
+    install_recommends: no
+  with_items:
+    - dnsutils
+    - ntp
+  when: ansible_os_family == "Debian"
+
+- name: Upgrade all packages to the latest version (apt)
+  shell: apt-get -o \
+       Dpkg::Options::=--force-confdef -o \
+       Dpkg::Options::=--force-confold -q -y \
+       dist-upgrade
+  environment:
+    DEBIAN_FRONTEND: noninteractive
+  when: ansible_os_family == "Debian"
+
+
+# Create deployment user if required
+- include: user.yml
+  when: k8s_deployment_user is defined
+
+# Set proper sysctl values
+- include: sysctl.yml