Replace AWS Lambda adapter with custom function

netlify/functions/validate-pr.ts

@@ -0,0 +1,22 @@
+import type { Handler, HandlerEvent, HandlerContext } from '@netlify/functions';
+import { createProbot } from 'probot';
+
+import { appFn } from '../../appFn';
+
+const privateKey = (process.env.PRIVATE_KEY as string).replace(/\\n/gm, '\n');
+
+const handler: Handler = async (
+  event: HandlerEvent,
+  context: HandlerContext
+) => {
+  const probot = createProbot({ overrides: { privateKey } });
+
+  await appFn(probot);
+
+  return {
+    statusCode: 200,
+    body: 'Playlist Entry Validator by Maciej Pędzich'
+  };
+};
+
+export { handler };