You shouldn't. Instead you should use proper secrets management system that would provide you unlocked SSL certificate.

---

By secret management I mean tooling like [k8s secret management][1] or [Vault][2].

You can read [Medium post about secrets](https://medium.com/on-docker/secrets-and-lie-abilities-the-state-of-modern-secret-management-2017-c82ec9136a3d). 


  [1]: https://kubernetes.io/docs/concepts/configuration/secret/
  [2]: https://www.vaultproject.io