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GitHub Actions Cookbook

GitHub Actions Cookbook

By : Michael Kaufmann
4.8 (5)
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GitHub Actions Cookbook

GitHub Actions Cookbook

4.8 (5)
By: Michael Kaufmann

Overview of this book

Say goodbye to tedious tasks! GitHub Actions is a powerful workflow engine that automates everything in the GitHub ecosystem, letting you focus on what matters most. This book explains the GitHub Actions workflow syntax, the different kinds of actions, and how GitHub-hosted and self-hosted workflow runners work. You’ll get tips on how to author and debug GitHub Actions and workflows with Visual Studio Code (VS Code), run them locally, and leverage the power of GitHub Copilot. The book uses hands-on examples to walk you through real-world use cases that will help you automate the entire release process. You’ll cover everything, from automating the generation of release notes to building and testing your software and deploying securely to Azure, Amazon Web Services (AWS), or Google Cloud using OpenID Connect (OIDC), secrets, variables, environments, and approval checks. The book goes beyond CI/CD by demonstrating recipes to execute IssueOps and automate other repetitive tasks using the GitHub CLI, GitHub APIs and SDKs, and GitHub Token. You’ll learn how to build your own actions and reusable workflows to share building blocks with the community or within your organization. By the end of this GitHub book, you'll have gained the skills you need to automate tasks and work with remarkable efficiency and agility.
Table of Contents (10 chapters)
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Auto-scaling self-hosted runners

In this recipe, we’ll be building on the previous recipe so that we have a solution that automatically starts a new instance of the ephemeral Docker container every time a new workflow is triggered. We’ll use a GitHub webhook for that.

Getting ready…

Make sure you still have the simple-ubuntu-runner Docker image we created in the previous recipe on your machine or GitHub Codespaces.

How to do it…

  1. Go to https://github.com/settings/apps and click on New GitHub App.
  2. Set GitHub App Name to auto-scale-runners and Homepage URL to the URL of the repository you are using (see Figure 4.6):
Figure 4.6 – Setting the name and URL for the new app

Figure 4.6 – Setting the name and URL for the new app

  1. Skip the Identifying and authorizing users and Post installation section and proceed to Webhook.
  2. Open another browser tab, go to https://smee.io, and click on Start new channel. Copy the Webhook Proxy URL value.
  3. Go back...

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