chore(secret): autogenerate smtp cred

[ArtieReus]

[majewsky]

@VoigtS Can you please align with Arturo? We should be using Campfire here to avoid double work.

[VoigtS]

I talked with Arturo about it, they also need to handle ec2 Credentials which Campfire handles by itself. So I see the potential to simplify elektra here. The result was that they discuss it internally how the further progress goes. If they decide to utilize Campfire, I'm happy to support if they encounter any issues with their implementation.