Feat/db authentication with azure identity token

[IanR01]

Changes to the api- and auth-server, so a database (MySQL) connection can be made in an Azure context (in this case specific for Amsterdam):

• a little refactoring of the code setting the SSL config
• option to set 'require ssl' with the env DB_REQUIRE_SSL
• prepared the code for additional database authentication methods, by setting the DB_AUTH_METHOD env-var
• added the 'azure-auth-token' option for DB_AUTH_METHOD, using a WorkloadIdentityCredential from the @azure/identity package

[rudivanhierden]

Thanks! The code looks fine, although there is some repeated files — but we will need to ensure that general packages are loaded for auth-server first before we can refactor that into a package, so that's fine for this PR.

Can you maybe supply some documentation about how to connect to the database through Azure? It's a new use-case that we are not familiar with, so any extra information would be very helpful 💪

[IanR01]

Gerelateerd ticket: https://openstad.dev/ticket?openstadResourceId=165