docs: def base64_decodefile(instr, outfile):
      r'''
      Decode a base64-encoded string and write the result to a file
  
      .. versionadded:: 2016.3.0
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' hashutil.base64_decodefile instr='Z2V0IHNhbHRlZAo=' outfile='/path/to/binary_file'
      '''
      encoded_f = StringIO(instr)
  
      with salt.utils.files.fopen(outfile, 'wb') as f:
          base64.decode(encoded_f, f)
  
      return True