@spec secret_files_changed?() :: boolean()

Checks if the local decrypted files are in sync with the encrypted ones.

This could be useful in deployment process. For instance, to abort deployment if secrets diverge:

if Mix.Secrex.secret_files_changed?() do
  Mix.raise(
    "Secret files are not in sync. Please run \"mix secrex.decrypt\" to retrieve latest updates."
  )
end