From the official Docker Hub image page:
Alternative implementation of the Bitwarden server API written in Rust and compatible with upstream Bitwarden clients, perfect for self-hosted deployment where running the official resource-heavy service might not be ideal. Image is based on Rust implementation of Bitwarden API.
The deploy.yaml uses the official Docker image to deploy a basic configuration of Vaultwarden Server on Akash using persistent storage. Vaultwarden also requires HTTPS due to its use of web crypto APIs.
See the Vaultwarden Wiki (https://github.com/dani-garcia/vaultwarden/wiki/) for more information on how to configure and run the Vaultwarden server.