cert-manager-webhook-freens: Let's Encrypt certificates for Kubernetes via free Russian DNS

The author introduces cert-manager-webhook-freens, a plugin for cert-manager that automates the issuance of wildcard Let's Encrypt certificates in Kubernetes using the free Russian DNS hosting service FreeNS. The need for this tool arose from the limitations of popular DynDNS services like DuckDNS, which suffer from high TTL values, making it difficult to switch between clusters. The article details the process of selecting an alternative DNS provider, the challenges faced when configuring cert-manager, and the technical implementation of the custom webhook. This article is intended for DevOps engineers and system administrators working with Kubernetes who need a reliable way to manage TLS certificates on a budget or under specific infrastructure requirements. The project is released as an open-source solution for the community.