Use python3.8-slim base in pubsub-sample (#225)
Use python3.8-slim base in pubsub-sample (#225)


mastersingh24/kubernetes-engine-samples,mastersingh24/kubernetes-engine-samples,GoogleCloudPlatform/kubernetes-engine-samples,mastersingh24/kubernetes-engine-samples,mastersingh24/kubernetes-engine-samples,mastersingh24/kubernetes-engine-samples,GoogleCloudPlatform/kubernetes-engine-samples,GoogleCloudPlatform/kubernetes-engine-samples,mastersingh24/kubernetes-engine-samples,GoogleCloudPlatform/kubernetes-engine-samples,mastersingh24/kubernetes-engine-samples,mastersingh24/kubernetes-engine-samples,GoogleCloudPlatform/kubernetes-engine-samples,mastersingh24/kubernetes-engine-samples,GoogleCloudPlatform/kubernetes-engine-samples,GoogleCloudPlatform/kubernetes-engine-samples,GoogleCloudPlatform/kubernetes-engine-samples,GoogleCloudPlatform/kubernetes-engine-samples