Improve BTCPay integration

[apotdevin]

Is your feature request related to a problem? Please describe.
The integration with BTCPay can be much better and provide more functionality.

Describe the solution you'd like

• Add a way to load macaroons from a provided directory.
• And multi-arch images to support raspberry pi, rock pi, etc

Additional context

To consider:

• Add some way to auth: The preferred way is to generate a cookie file which a secret(password) and tell btcpay the location. BTCPay then loads it and generates a one-time url to access your app. Your app validates the secret against the file, and then generates a new cookie file(replaces old one) for the next auth attempt.

[apotdevin]

Cookie authentication was added with #38 which should enable BTCPayServer full integration