Enable src attribute in script tag.

Ruby scripts can be written in files with the rb extension.
This is more compatible with editor support than Ruby scripts written inline in the script tag.

Author: ledsun

packages/npm-packages/ruby-wasm-wasi/src/browser.script.ts

@@ -15,12 +15,18 @@ export const main = async (pkg: { name: string, version: string }) => {
     runRubyScriptsInHtml(vm);
 };
 
-const runRubyScriptsInHtml = (vm) => {
+const runRubyScriptsInHtml = async (vm) => {
     const tags = document.getElementsByTagName("script");
     for (var i = 0, len = tags.length; i < len; i++) {
         const tag = tags[i];
         if (tag.type === "text/ruby") {
-            if (tag.innerHTML) {
+            if (tag.hasAttribute('src')){
+                const response = await fetch(
+                    tag.getAttribute('src')
+                );
+                const rubyScript = await response.text();
+                vm.eval(rubyScript);
+            } else if (tag.innerHTML) {
                 vm.eval(tag.innerHTML);
             }
         }