feat(cli): support config site publicPath and outputDir

packages/vant-cli/src/config/webpack.site.prd.ts

@@ -1,15 +1,19 @@
 import merge from 'webpack-merge';
-import { join } from 'path';
+import { get } from 'lodash';
 import { siteDevConfig } from './webpack.site.dev';
 import { getWebpackConfig } from '../common';
+import { CONFIG, SITE_DIST_DIR } from '../common/constant';
+
+const outputDir = get(CONFIG, 'build.site.outputDir', SITE_DIST_DIR);
+const publicPath = get(CONFIG, 'build.site.publicPath', '/');
 
 export const sitePrdConfig = merge(
   siteDevConfig,
   {
     mode: 'production',
     output: {
-      path: join(__dirname, '../../site/dist'),
-      publicPath: 'https://b.yzcdn.cn/vant/',
+      publicPath,
+      path: outputDir,
       filename: '[name].[hash:8].js',
       chunkFilename: 'async_[name].[chunkhash:8].js'
     }