Workaround scp behaviour in OpenSSH 9.0

scp in OpenSSH 9 now uses SFTP by default, which breaks the Packer /
Ansible / SSH Proxy interaction

See hashicorp/packer-plugin-ansible#100
And hashicorp/packer#11783

Adding the `-O` flag to  the `scp` command forces the old protocol to be
used.

images/capi/packer/qemu/packer.json

@@ -72,6 +72,7 @@
         "KUBEVIRT={{user `kubevirt`}}"
       ],
       "extra_arguments": [
+        "--scp-extra-args", "'-O'",
         "--extra-vars",
         "{{user `ansible_common_vars`}}",
         "--extra-vars",
@@ -99,6 +100,7 @@
         "KUBEVIRT={{user `kubevirt`}}"
       ],
       "extra_arguments": [
+        "--scp-extra-args", "'-O'",
         "--extra-vars",
         "{{user `ansible_common_vars`}}",
         "--extra-vars",