chore: add octokit type

Author: technote-space

src/index.ts

@@ -3,6 +3,7 @@ import Command from './command';
 import ApiHelper from './api-helper';
 import GitHelper from './git-helper';
 
+export * as Types from './types';
 export * as Utils from './utils';
 export * as ContextHelper from './context-helper';
 

src/types.ts

@@ -0,0 +1,3 @@
+import {GitHub} from '@actions/github/lib/utils';
+
+export type Octokit = InstanceType<typeof GitHub>;