kvm2: integration test, sample Proxy, providers-config entries and Makefile target

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

config/samples/providers-config.yaml

@@ -55,3 +55,34 @@ providers:
           bridge: br0                 # to a LAN with DHCP; the VM's IP comes from there
           # socket: /var/run/libvirt/libvirt-sock
           # pool: default
+  # kvm2 takes the same block shape as kvm: an entry ports by changing type
+  # to kvm2 and the block name to kvm2. kvm2 does not adopt domains made by
+  # kvm, so delete those Proxies first. See docs/kvm2-provider.md.
+  # - name: kvm2-home
+  #   type: kvm2
+  #   kvm2:
+  #     sshKeyFile: /etc/proxy-operator/kvm/id_ed25519
+  #     knownHostsFile: /etc/proxy-operator/kvm/known_hosts
+  #     # insecureIgnoreHostKey: true
+  #     # diskSizeGb: 10
+  #     # installGuestAgent: false
+  #     # vendorData: |
+  #     #   #cloud-config
+  #     #   ...
+  #     images:
+  #       debian-13:
+  #         url: https://cloud.debian.org/images/cloud/trixie/latest/debian-13-generic-amd64.qcow2
+  #         # sha256: "<64 hex>"
+  #         # firmware: uefi
+  #       ubuntu-24.04:
+  #         url: https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img
+  #     machineTypes:
+  #       small:  {vcpus: 1, memoryMiB: 1024}
+  #       medium: {vcpus: 2, memoryMiB: 2048}
+  #     hosts:
+  #       - name: beelink
+  #         address: beelink:22
+  #         user: novakj
+  #         bridge: br0
+  #         # socket: /var/run/libvirt/libvirt-sock
+  #         # pool: default