Private plugin setup doesnt work

### Welcome! - [x] Yes, I've searched similar issues on [GitHub](https://github.com/traefik/traefik-helm-chart/issues) and didn't find any. - [x] Yes, I've searched similar issues on the [Traefik community forum](https://community.traefik.io) and didn't find any. ### What version of the Traefik's Helm Chart are you using? 39.0.6 ### What version of Traefik are you using? v3.6.11 ### What did you expect to happen ? If set-up private github repository as the documentation https://doc.traefik.io/traefik-hub/api-gateway/guides/plugin-development-guide#option-b-private-plugin ``` hub: pluginRegistry: sources: github-public: baseModuleName: "github.com" github: token: "urn:k8s:secret:github-plugin-token:token" ``` ### What did you notice instead ? Pod fails with {"level":"error","error":"command traefik error: failed to decode configuration from flags: field not found, node: hub","time":"2026-04-09T15:22:44Z","message":"Command error"} ### What are your values ? ``` hub: pluginRegistry: sources: github-public: baseModuleName: "github.com" github: token: "urn:k8s:secret:github-plugin-token:token" ``` ### Additional Information ```shell ```