Explicitly request a maximum of 1 instance from the scheduler
Explicitly request a maximum of 1 instance from the scheduler

Ensures that we stay within the free App Engine quota, at least for
compute.

See https://stackoverflow.com/a/65234591/343108 for more details,
changes verified with the API explorer (https://cloud.google.com/appengine/docs/admin-api/reference/rest/v1/apps.services.versions/get)
as described by https://cloud.google.com/appengine/docs/standard/python/config/setting-autoscaling-params-in-explorer

mihaip/streamspigot,mihaip/streamspigot,mihaip/streamspigot,mihaip/streamspigot