Example of lambda 3.7 runtime and function
lambda_function.py was copied from lambci/examples/python/lambda_function.py
for playing in dev cluster (eg. minikube), install mini refunc in refunc-play namespace
docker run --rm -it -e REFUNC_ENV=cluster refunc/refunc refunc play gen -n refunc-play | kubectl apply -f - && kubectl get all -n refunc-play
kubectl create -f . -n refunc-play