Enable Github Actions with Turbporepo Remote Caching

Github Actions helps to automate the building, testing, and deploying of your applications. We'll configure our actions in the ci.yml file in a new directory called .github/workflows. When that file is configured, we can update our scripts in our package.json to run off of those. We will also need to make/set up our TURBO_TOKEN and our TURBO_TEAM which we will create on Vercel and Github.