General Improvements (#70)

# General Improvements

> This is a classic @GrantBirki drive-by PR 🚗

This pull request does the following:

- Lightly updates and formats a few existing Actions workflows
- Adds a new `package-check` workflow to validate the contents of the
`dist/` directory have been properly built
- Uses a `.node-version` file so that local development and Actions
remain on the same pinned version of node
- Adds status badges to the readme for visual effect ⭐ 🎨

README.md

@@ -1,5 +1,7 @@
 # Create GitHub App Token
 
+[![test](https://github.com/actions/create-github-app-token/actions/workflows/test.yml/badge.svg)](https://github.com/actions/create-github-app-token/actions/workflows/test.yml)
+
 GitHub Action for creating a GitHub App installation access token.
 
 ## Usage
@@ -46,7 +48,7 @@ jobs:
           # required
           app-id: ${{ vars.APP_ID }}
           private-key: ${{ secrets.PRIVATE_KEY }}
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           token: ${{ steps.app-token.outputs.token }}
           ref: ${{ github.head_ref }}