The function get_workflow_runs() is missing several important params from the API. The following params are currently missing:

• per_page (integer): The number of results per page, defaults to 30 (max 100).
• page (integer): Page number of the results to fetch, default 1.
• created (string): Returns workflow runs created within the given date-time range. For more information on the syntax, see "Understanding the search syntax." (datetime would be awesome here as mentioned by @trim21 )
• check_suite_id (integer): Returns workflow runs with the check_suite_id that you specify.