Those who want to test APIs usually need passwords or tokens, which almost all API test clients keep plaintext. With Hashicorp Vault as a secret manager, however, you have a way to remedy this deficiency as well.
Hashicorp Vault is an incredible tool when it comes to keeping passwords safe on the server. Using Authelia as an example, I will show how to keep Docker passwords secure on the server even without Docker swarm.
Few know that you can also configure Nextcloud via environment variables. With this possibility you can save the storage of passwords in the Nextcloud config.php.