demo: add flask and k3s deployment files

To enable demonstrations of application container builds, and deployment
to k*s clusters, we introduce a simple recipes-demo/ structure with a
sample flask application and deployment yaml.

i.e. ensure that "helloworld-flask-deploy" is installed on your image,
and then:

 % kubectl apply -f /etc/flask-app.yaml
 % kubectl label pods zeddii-pod new-label=yoctorule
 % kubectl expose pod zeddii-pod  --port=9000  --target-port=9000 --type=LoadBalancer --name=my-service

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

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