In this chapter, we delved into the fundamentals of OIDC in GitHub Actions, explored the setup and configuration of a HashiCorp Cloud Vault instance, and demonstrated how to leverage OIDC authentication and authorization to access secrets and communicate with Slack securely. We began by gaining a solid understanding of OIDC and its role in secure authentication and authorization. We explored the key concepts and principles of OIDC and its relevance in the GitHub Actions context.

Next, we set up a HashiCorp Cloud Vault instance and configured it to store our secrets securely. We learned how to authenticate and authorize a caller of a workflow using OIDC, establishing a secure connection between GitHub Actions and the Vault instance. With the authentication and authorization mechanisms in place, we seamlessly integrated Vault secrets into our GitHub Actions workflows. We accessed the secrets securely and utilized them to communicate with Slack, ensuring that sensitive information...