Add Continuous deployment

[hoh]

We would like to add continuous deployment of the main branch of aleph-account, for example on alpha.account.aleph.im .

A first part of the work is done with #49 , which uploads the files on IPFS and obtains a CID.

The next steps are:

• Pin the CID on Aleph.im by sending a message on the network. The key sending the message should only be stored inside GitHub Actions and available to the main branch.
• Create a secure process that watches messages from this address and updates the DNSLink DNS record accordingly using Gandi's API.

DNS credentials are very sensitive, so this must be well secured. I am thinking about running the process on a physical device (not hosted), not exposed to the internet.