Firestore backend only supports byte array data

[AlexMeuer]

Viper uses github.com/bketelsen/crypt to fetch remote configs. Crypt supports fetching from Firestore but only grabs a field named data which it expects to be an encrypted byte array.

If I'm using Firestore as a config backend, I'm not encrypting the config, I'm putting it there for ease of change. Having to use a single pre-determined field breaks that convenience.

[sagikazarmark]

Unfortunately this is how the current remote provider works. This will probably change in Viper v2, until then, I would suggest implementing a custom remote provider based on this:

https://github.com/sagikazarmark/viperx

Basically, I've implemented the same thing for Vault.