Working with GitHub Actions Environment Variables and Secrets

GitHub Actions provides features for managing environment variables and secrets, which are crucial for securely handling sensitive information like API keys and certificates in CI/CD workflows. Environment variables allow for dynamic runtime values and are suitable for nonsensitive data, while secrets offer encrypted storage for sensitive information. Implementing these within GitHub Actions involves defining variables at different scopes, from individual steps to entire workflows, and leveraging GitHub's built-in secrets manager for secure handling. The process includes encoding sensitive information, such as certificates, to protect against exposure in build logs. Additionally, tools like Earthly can complement GitHub Actions by simplifying build processes, offering local testing, and supporting complex workflows, enhancing the overall CI/CD experience by improving build speed and consistency without the need for extensive YAML configuration.