Provide a Docker image

### Please agree to the following

- [X] I have searched [existing issues](https://github.com/cryptomator/cli/issues?q=) for duplicates
- [X] I agree to follow this project's [Code of Conduct](https://github.com/cryptomator/cli/blob/develop/.github/CODE_OF_CONDUCT.md)

### Summary

As a user, I want to be able to unlock my vaults in an infrastructure environment using Docker.

### Motivation

With the [0.6.0](https://github.com/cryptomator/cli/commit/cbcdff160b4b3845f7a0ff570bcc65a4b1b7fcda) release, we dropped support for Docker but I think providing a docker image is crucial in the CLI context.

### Considered Alternatives

_No response_

### Anything else?

_No response_

Inizia esaminando il commit di release 0.6.0 collegato nell’issue e la configurazione attuale di build e packaging della CLI. Definisci il workflow supportato per sbloccare il vault dell’immagine Docker e verifica che possa essere eseguito in un ambiente infrastrutturale; l’issue non fornisce file o test specifici.

Scritto dal modello di indicizzazione a partire dal testo della issue.