Johannes Kastl enhanced the suitenumerique/docs repository by overhauling Helm chart environment variable management to support more flexible and secure Kubernetes deployments. He introduced expanded provisioning for environment variables, enabling mounting of Secrets via extraVolumes and supporting multi-key injection from ConfigMaps and Secrets using envFrom for Deployments, Jobs, and CronJobs. His work in YAML and DevOps practices improved manifest consistency and reduced configuration drift across environments. Johannes also addressed a rendering bug by ensuring env blocks appear only when variables are defined, maintaining clean manifests. The changes preserved backward compatibility, demonstrating thoughtful engineering and a deep understanding of Helm and Kubernetes workflows.