def set_env_variables(stack, grid, platform = grid)
      ENV['STACK'] = stack
      ENV['GRID'] = grid
      ENV['PLATFORM'] = platform
    end
def set_env_variables(stack, grid, platform = grid)
      ENV['STACK'] = stack
      ENV['GRID'] = grid
      ENV['PLATFORM'] = platform
    end
Sets environment variables from parameters
 @param stack [String] current stack name
 @param grid [String] current grid name
 @param platform [String] current platform name, defaults to param grid value