feat: use same permissions used at repo checkout

closes #115

README.md

@@ -4,7 +4,7 @@ This action will bump version, tag commit and generate a changelog with conventi
 
 ## Inputs
 
-- **Required** `github-token`: Github token.
+- **Optional** `github-token`: Github token, if different permissions required than from checkout.
 - **Optional** `git-message`: Commit message that is used when committing the changelog.
 - **Optional** `git-user-name`: The git user.name to use for the commit. Default `Conventional Changelog Action`
 - **Optional** `git-user-email`: The git user.email to use for the commit. Default `conventional.changelog.action@github.com`
@@ -56,9 +56,9 @@ A bunch of useful environment variables are available to the script with `proces
 ### Pre-Changelog-Generation hook
 
 > Function in a specified file will be run right before the changelog generation phase, when the next
-> version is already known, but it was not used anywhere yet. It can be useful if you want to manually update version or tag. 
+> version is already known, but it was not used anywhere yet. It can be useful if you want to manually update version or tag.
 
-Same restrictions as for the pre-commit hook, but exported functions names should be `preVersionGeneration` for modifications to the version and `preTagGeneration` for modifications to the git tag. 
+Same restrictions as for the pre-commit hook, but exported functions names should be `preVersionGeneration` for modifications to the version and `preTagGeneration` for modifications to the git tag.
 
 Following props will be passed to the function as a single parameter and same output is expected:
 
@@ -73,7 +73,7 @@ export function preTagGeneration(tag: string): string {}
 ### Config-File-Path
 A config file to define the conventional commit settings. Use it if you need to override values like `issuePrefix` or `issueUrlFormat`. If you set a `config-file-path`, the `preset` setting will be ignored. Therefore use an existing config and override the values you want to adjust.
 
-example:  
+example:
 ```javascript
 'use strict'
 const config = require('conventional-changelog-conventionalcommits');
@@ -188,6 +188,18 @@ Github releases
     body: ${{ steps.changelog.outputs.clean_changelog }}
 ```
 
+Use a deploy key
+
+```yaml
+- name: Checkout GitHub Action
+  uses: actions/checkout@v2
+  with:
+    ssh-key: ${{ secrets.SSH_DEPLOY_KEY }}
+- name: Conventional Changelog Action
+  id: changelog
+  uses: TriPSs/conventional-changelog-action@v3
+```
+
 ## Development
 
 If you'd like to contribute to this project, all you need to do is clone and install [act](https://github.com/nektos/act) this project and run:

action.yml

@@ -12,7 +12,7 @@ branding:
 inputs:
   github-token:
     description: 'Github token'
-    required: true
+    required: false
 
   git-message:
     description: 'Commit message to use'

src/helpers/git.js

@@ -11,7 +11,7 @@ module.exports = new (class Git {
   commandsRun = []
 
   constructor() {
-    const githubToken = core.getInput('github-token', { required: true })
+    const githubToken = core.getInput('github-token')
 
     // Make the Github token secret
     core.setSecret(githubToken)
@@ -37,7 +37,9 @@ module.exports = new (class Git {
     this.config('user.email', gitUserEmail)
 
     // Update the origin
-    this.updateOrigin(`https://x-access-token:${githubToken}@github.com/${GITHUB_REPOSITORY}.git`)
+    if (githubToken) {
+      this.updateOrigin(`https://x-access-token:${githubToken}@github.com/${GITHUB_REPOSITORY}.git`)
+    }
   }
 
   /**