A provider for BoRuDar's configuration package that loads configuration values from files in a given directory.
On your configuration struct, you define the secret_file tag with the name of the file that contains the value you
want to load. The provider will read the file and provide the content of the file as the value for the field.
The provider will look for files in the /run/secrets directory by default. As such specifying the secret_file tag
with the value my_secret will make the provider look for a file named /run/secrets/my_secret.
The tag and the directory can be customized when creating the provider. Please refer to the documentation for more information.