feat: give machine name to devstar home

src/home.ts

@@ -1,4 +1,5 @@
 import * as vscode from 'vscode';
+import * as os from 'os';
 import RemoteContainer from './remote-container';
 import User from './user';
 import * as utils from './utils'
@@ -104,6 +105,9 @@ export default class DSHome {
               panel.webview.postMessage({command: 'createUserPublicKey', data: {ok: false}})
               break;
             }
+          case 'getMachineName':
+            const machineName = os.hostname();
+            panel.webview.postMessage({command: 'getMachineName', data: {machineName: machineName}})
           case 'getDefaultPublicKey':
             var defaultPublicKey;
             if (utils.existDefaultPublicKey()) {