Active job runtime calculation can be incorrect

[alex-ketch]

There seems to be an issue with the job.runtime_seconds calculation which causes the progress bar for file conversions to immediately jump to 100%.

hub/manager/jobs/models.py

Lines 870 to 884 in c8bb8dd

	@cached_property
	def runtime_seconds(self) -> Optional[float]:
	"""
	Get the runtime in seconds.
	"""
	if self.runtime is not None:
	return self.runtime
	elif self.is_active and self.began:
	return (timezone.now() - self.began).seconds
	elif self.ended and self.began:
	return (self.ended - self.began).seconds
	else:
	return None

In trying to debug locally, I noticed that the timezones were different between the now and began timestamps.