feat(auth): op-level IAM for EKS under --enforce-auth (AUTHZ-X1g-2) - #1540

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-go@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

gofmt needed on the following files (advisory):