Add build script for ruby-head-wasm-emscripten

Author: kateinoigakukun

packages/npm-packages/ruby-head-wasm-emscripten/package.json

@@ -10,6 +10,9 @@
     "dist/ruby_stdlib.data",
     "README.md"
   ],
+  "scripts": {
+    "build": "./build-package.sh ../../../rubies/head-wasm32-unknown-emscripten-full"
+  },
   "repository": "https://github.com/ruby/ruby.wasm",
   "homepage": "https://github.com/ruby/ruby.wasm/tree/main/packages/npm-packages/ruby-head-wasm-emscripten",
   "publishConfig": {