Simplify rake task for decrypting energy balances and make it more robust
Simplify rake task for decrypting energy balances and make it more robust

- Always require .password file instead of environment variable or manual input -
  in practice the other methods were only used on the CI server anyways
- Use "--passphrase-file" instead of "--passphrase-fd" because of incompatibilities
  with certain gpg versions
- Use gpg with "--batch --yes --no-use-agent" to ensure proper usage of the
  given options for different gpg versions

quintel/etsource