feat!: Added command to serve config files over tftp

This is a breaking change as the return type of cluster.nodes has
changed, resulting in old templates potentially no longer working.

src/node.rs

@@ -178,6 +178,10 @@ impl Node {
         Node { patches, ..node }
     }
 
+    pub fn hostname(&self) -> &str {
+        &self.hostname
+    }
+
     pub async fn config(&self, cluster: &Cluster) -> String {
         let mut command = Command::new("talosctl");
         command.args([