feat(h5): add UNI_H5_BASE

packages/shims-node.d.ts

@@ -15,5 +15,6 @@ declare namespace NodeJS {
     UNI_NVUE_STYLE_COMPILER: 'uni-app' | 'weex'
     UNI_APP_CODE_SPLITING?: 'true'
     UNI_AUTOMATOR_WS_ENDPOINT?: string
+    UNI_H5_BASE?: string
   }
 }

packages/vite-plugin-uni/src/config/index.ts

@@ -31,7 +31,7 @@ export function createConfig(
     }
     options.base = base!
     return {
-      base,
+      base: process.env.UNI_H5_BASE || base,
       root: process.env.VITE_ROOT_DIR,
       // TODO 临时设置为__static__,屏蔽警告：https://github.com/vitejs/vite/blob/824d042535033a5c3d7006978c0d05c201cd1c25/packages/vite/src/node/server/middlewares/transform.ts#L125
       publicDir: config.publicDir || '__static__',