Fix bunx (#18)

* Add symlink for bunx

* Remove node_modules, use bundled code instead

* Add revision support

src/action.ts

@@ -10,8 +10,9 @@ setup({
   version: action.getInput("bun-version") || undefined,
   customUrl: action.getInput("bun-download-url") || undefined,
 })
-  .then(({ version, cacheHit }) => {
+  .then(({ version, revision, cacheHit }) => {
     action.setOutput("bun-version", version);
+    action.setOutput("bun-revision", revision);
     action.setOutput("cache-hit", cacheHit);
   })
   .catch((error) => {