Integrate zero trust workload identity manager with Red Hat OpenShift GitOps

A step-by-step guide to integrating Red Hat's zero trust workload identity manager (SPIFFE/SPIRE) with OpenShift GitOps (Argo CD) to enable short-lived, token-free authentication between a management OpenShift cluster and remote spoke clusters. The setup involves deploying the zero trust workload identity manager operator, configuring an Argo CD instance in a custom namespace to receive SPIFFE identities via CSI driver, enabling external OIDC authentication on the spoke cluster, and creating RBAC bindings for SPIFFE-based identities. The result is that Argo CD can manage remote clusters using cryptographically-attested workload identities instead of long-lived static tokens, improving security posture. A current limitation is that enabling external authentication restricts the spoke cluster to SPIFFE-only authentication until multi-provider support arrives in a future OpenShift release.