switch to ESM and update config/test wiring

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

__tests__/context.test.ts

@@ -1,6 +1,6 @@
 import {expect, test} from 'vitest';
 
-import {getInputs} from '../src/context';
+import {getInputs} from '../src/context.js';
 
 test('with password and username getInputs does not throw error', async () => {
   process.env['INPUT_USERNAME'] = 'dbowie';