[CORE] Setup watcher on config file

[pedromotita]

➕ Enhancement Request

Problem related to enhancement request

As of today our viper setup is not watching changes on the configuration file. This means that we have to run viper.ReadInConfig() to update viper whenever we update the config file (i.e: config.Set and config.Delete())

Sought-for solution

Setup a watcher on our config file so config changes are automatically handled by viper

Additional context

There has been an failed attempt to implement a watcher. This comment contains the findings and conclusion