add runcmd to copy autoinstall from user-data to /autoinstall.yaml

live-build/ubuntu-server/includes.binary/overlay/etc/cloud/cloud.cfg

@@ -116,3 +116,15 @@ system_info:
          primary: http://ports.ubuntu.com/ubuntu-ports
          security: http://ports.ubuntu.com/ubuntu-ports
    ssh_svcname: ssh
+
+runcmd:
+ - - "python3"
+   - "-c"
+   - |
+     import subprocess, sys, yaml
+     user_data = yaml.safe_load(subprocess.run([
+         "cloud-init", "query", "userdata"],
+         check=True, stdout=subprocess.PIPE, encoding='utf-8').stdout)
+     if 'autoinstall' in user_data:
+         with open("/autoinstall.yaml", "w") as fp:
+             yaml.dump(user_data['autoinstall'], fp)