Agenix too verbose

[NicolasGuilloux]

Hello there!

First of all, thank you for Agenix, it is a very convenient yet secure solution for password and I have been using it for more than 1 year :)

I would Agenix to be less verbose though. I don't add new secrets very often, but everytime I rebuild the system, I found my terminal flooded with decrypting '/nix/store/...' to '/run/agenix.d/*/...'. I'd like to reduce this using an option.

This specific line is the most verbose but I'd like to take it a step further.

What about creating an option called verbosity, which stands for the following behaviour:

Verbosity	Explanation
0	Absolutely no message while rebuilding.
1	Just a small message like [agenix] Decrypting and binding
2	Every steps but the decrypting '/nix/store/...' to '...'
3	Everything like the current state

One last thing is maybe remove the verbosity level 3 but instead providing a diff.

I'm open, feel free to give any feedback or advice :)