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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def refresh_db(**kwargs):
    '''
    Updates the package list

    - ``True``: Database updated successfully
    - ``False``: Problem updating database

    CLI Example:

    .. code-block:: bash

        salt '*' pkg.refresh_db
    '''
    ret = {}
    cmd = ['apk', 'update']
    call = __salt__['cmd.run_all'](cmd,
                                   output_loglevel='trace',
                                   python_shell=False)
    if call['retcode'] == 0:
        errors = []
        ret = True
    else:
        errors = [call['stdout']]
        ret = False

    if errors:
        raise CommandExecutionError(
            'Problem encountered installing package(s)',
            info={'errors': errors, 'changes': ret}
        )

    return ret