feat: pre-authenticationd [@octokit/core](https://github.com/octokit/core.js) instance

Author: gr2m

src/index.ts

@@ -1,6 +1,9 @@
 import { Octokit as Core } from "@octokit/core";
 import { createActionAuth } from "@octokit/auth-action";
 
+import { VERSION } from "./version";
+
 export const Octokit = Core.defaults({
-  auth: createActionAuth()
+  auth: createActionAuth(),
+  userAgent: `octokit-action.js/${VERSION}`
 });

src/version.ts

@@ -0,0 +1 @@
+export const VERSION = "0.0.0-development";