Add cloud init configuration to VM definition

virtweb_backend/src/utils/cloud_init_utils.rs

@@ -0,0 +1,19 @@
+/// VM Cloud Init configuration
+///
+/// RedHat documentation: https://docs.redhat.com/fr/documentation/red_hat_enterprise_linux/9/html/configuring_and_managing_cloud-init_for_rhel_9/configuring-cloud-init_cloud-content
+/// cloud-localds source code: https://github.com/canonical/cloud-utils/blob/main/bin/cloud-localds
+#[derive(Clone, Debug, serde::Serialize, serde::Deserialize, Default)]
+pub struct CloudInitConfig {
+    attach_config: bool,
+    /// Main user data
+    user_data: String,
+    /// Instance ID, set in metadata file
+    #[serde(skip_serializing_if = "Option::is_none")]
+    instance_id: Option<String>,
+    /// Local hostname, set in metadata file
+    #[serde(skip_serializing_if = "Option::is_none")]
+    local_hostname: Option<String>,
+    /// Network configuration
+    #[serde(skip_serializing_if = "Option::is_none")]
+    network_configuration: Option<String>,
+}