feat(): Add dry option to run without committing changes (#9)

Sometimes you'd prefer tools to just tell you what's wrong, rather than
automatically making changes and commits in your repository

Author: ThisIsMissEm

README.md

@@ -14,3 +14,12 @@ Add the following to your workflow config
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 ```
 
+If you would prefer this action to not modify files for you, use the following config:
+
+```yaml
+    - name: Use current action
+      uses: getsentry/action-eslint-fix@v1
+      with:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        dry: true
+```

action.yml

@@ -8,6 +8,10 @@ inputs:
   GITHUB_TOKEN:
     description: 'GitHub token'
     required: true
+  dry:
+    description: Just runs eslint, doesn't commit any changes
+    required: false
+    default: false
 runs:
   using: 'node12'
   main: 'dist/index.js'

src/main.ts

@@ -9,6 +9,7 @@ import {getChangedFiles} from './getChangedFiles'
 async function run(): Promise<void> {
   try {
     const {owner, repo} = github.context.repo
+    const dryRun = core.getInput('dry')
     const token = core.getInput('GITHUB_TOKEN')
 
     if (!token) {
@@ -69,6 +70,10 @@ async function run(): Promise<void> {
       core.setFailed(err.message)
     }
 
+    if (dryRun) {
+      return
+    }
+
     for (const result of results) {
       const filePath = result.filePath.replace(
         `${process.env.GITHUB_WORKSPACE}/`,