Add new lint action

Author: raphaelstolt

README.md

@@ -281,6 +281,7 @@ Set up your GitHub Actions workflow with a specific version of your programming
 - [Lint terraform files using tflint, with reviewdog output on the PR](https://github.com/reviewdog/action-tflint)
 - [autopep8: Automatically formats Python code to conform to the PEP 8 style guide](https://github.com/peter-evans/autopep8)
 - [Run `ergebnis/composer-normalize` to ensure your PHP project has a normalized `composer.json`](https://github.com/ergebnis/composer-normalize-action)
+- [Run `stolt/lean-package-validator` to ensure your package has only the required `runtime` artifacts](https://github.com/raphaelstolt/lean-package-validator-action)
 - [Run Go lint checks on PR event](https://github.com/ArangoGutierrez/GoLinty-Action)
 - [Node.js - Automatically run the `format` and/or `lint` script used by the package](https://github.com/MarvinJWendt/run-node-formatter)
 - [Stylelinter - GitHub Action that runs stylelint](https://github.com/exelban/stylelint)