<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_envs_in_group(group_name, nova_creds):
 """ Takes a group_name and finds any environments that have a SUPERNOVA_GROUP configuration line that matches the group_name. """

    envs = []
    for key, value in nova_creds.items():
        supernova_groups = value.get('SUPERNOVA_GROUP', [])
        if hasattr(supernova_groups, 'startswith'):
            supernova_groups = [supernova_groups]
        if group_name in supernova_groups:
            envs.append(key)
        elif group_name == 'all':
            envs.append(key)
    return envs