Best practices working with self-hosted GitHub Action runners at scale on AWS | Amazon Web Services
Briefly

Understand that GitHub Self-hosted runners execute code defined within a GitHub repository, making AWS runner environments dependent on GitHub security. Key security best practices involve federating GitHub users, limiting administrative privileges, controlling runner registration and group settings, and avoiding public repository access.
Reduce security risks by implementing short-lived AWS credentials when deploying GitHub Self-Hosted Runners in AWS, ensuring that the credentials have a limited lifespan to minimize potential vulnerabilities.
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