Dockerhub pull rate limit reached when using Skaffold

From the Skaffold dev logs, deploying on local Minikube:
```
...
final build concurrency value is 4
Listing files to watch...
- nsd/cloudharness-base-debian
listing files: parsing ONBUILD instructions: retrieving image "python:3.7.6": GET https://index.docker.io/v2/library/python/manifests/3.7.6: TOOMANYREQUESTS: You have reached your pull rate limit. You may increase the limit by authenticating and upgrading: https://www.docker.com/increase-rate-limit
...
```

Start with the Skaffold deployment path used for local Minikube runs and trace where the Python base image is retrieved from Docker Hub. Confirm the expected behavior for deployments that hit Docker Hub's pull limit; the issue is done when the local deployment no longer fails at this image lookup.

Written by the indexing model from the issue text.