Default input to gitHub.token (#14)

Default github.token

README.md

@@ -12,13 +12,12 @@ Minimal setup.
   uses: Bhacaz/checkout-files@v1
   with:
    files: package.json
-   token: ${{ secrets.GITHUB_TOKEN }}
 ```
 
 ## Inputs
 
 |Name|Description|Required|Default|
 |---|---|---|---|
 |`files`|A list of files with the path separated by a space, relative to root of your repository. Can also be a folder and the action will recursively pull all the files.|`true`|N/A|
-|`token`|A GitHub token. Setting `${{ secrets.GITHUB_TOKEN }}` give acces to the one [automatically generated](https://docs.github.com/en/actions/security-guides/automatic-token-authentication). |`true`|N/A|
+|`token`|A GitHub token. |`false`|`${{ github.token }}`|
 |`branch`|Checkout files from a specific branch.|`false`|`master`|

action.yml

@@ -12,7 +12,7 @@ inputs:
     required: true
   token:
     description: 'A Github Private Access Token'
-    required: true
+    default: ${{ github.token }}
   branch:
     description: 'Branch to checkout files from'
     required: false

index.js

@@ -2,7 +2,7 @@ const core = require('@actions/core');
 const github = require('@actions/github');
 const fs = require('fs');
 
-const token = core.getInput('token', { required: true });
+const token = core.getInput('token');
 const octokit = github.getOctokit(token)
 
 const files = core.getInput('files', { required: true }).split(' ');