fix(examples): set context of basic example to __dirname (#2345)

Author: nieyuyao

examples/basic/rspack.config.js

@@ -2,14 +2,15 @@
  * @type {import('@rspack/cli').Configuration}
  */
 module.exports = {
-  entry: {
-    main: './src/index.js'
-  },
-  builtins: {
-    html: [
-      {
-        template: './index.html'
-      }
-    ]
-  }
-}
+	context: __dirname,
+	entry: {
+		main: './src/index.js'
+	},
+	builtins: {
+		html: [
+			{
+				template: './index.html'
+			}
+		]
+	}
+}