Streamline security with keyless signing and verification in GitLab

What this post added

This post introduces the integration of Sigstore's Cosign for keyless signing and verification within GitLab CI/CD pipelines. It details the challenges of traditional key management and the benefits of keyless signing, such as enhanced security, simplified management, and audit trails. The integration allows users to add a few lines to their `.gitlab-ci.yml` file to leverage Cosign, which requests short-lived key pairs, records signing events on a certificate transparency log (Rektor), and discards the keys. This eliminates the need for manual key setup, rotation, and distribution, significantly improving security and operational efficiency.