Update index.js

Author: Mathiyarasy

.github/actions/echo-hello/index.js

@@ -1,7 +1,7 @@
 const core = require('@actions/core');
 
 try {
-  const rts = core.getInput('rts');
+  const rts = process.env.rts;
   console.log(`Hello, ${rts}`);
 } catch (error) {
   core.setFailed(error.message);