feat: add templated network config

builds/linux/ubuntu/22-04-lts/data/network.pkrtpl.hcl

@@ -0,0 +1,19 @@
+  network:
+    network:
+      version: 2
+      ethernets:
+%{ if ip != null ~}
+        ${device}:
+          dhcp4: false
+          addresses:
+            - ${ip}/${netmask}
+          gateway4: ${gateway}
+          nameservers:
+            addresses:
+%{ for item in dns ~}
+              - ${item}
+%{ endfor ~}
+%{ else ~}
+        ${device}:
+          dhcp4: true
+%{ endif ~}

builds/linux/ubuntu/22-04-lts/data/user-data.pkrtpl.hcl

@@ -6,7 +6,8 @@ autoinstall:
   locale: ${vm_os_language}
   keyboard:
     layout: ${vm_os_keyboard}
-${storage}  
+${storage}
+${network} 
   identity:
     hostname: ubuntu-server
     username: ${build_username}