GitHub Actions is a fantastic CI/CD platform that allows you to set up custom workflows to do a variety of tasks, anything from running unit tests anytime there is a pull request to building your web application and deploying that application to your hosting service.
If you are not familiar with CI/CD, this is a method to allow you to frequently deliver software by introducing automation into your development process. The main concepts for CI/CD are: continuous integration, continuous delivery, and continuous deployment. As an example, let’s say you are working on an npm package and every time there is a pull request there is a setup of steps that you complete while reviewing the code: running unit tests, linting, updating documentation, etc. Then once the pull request is approved and merged, you then manually release a new version of the package and publish that package to the npm registry.