Get all namespaces with tiller deployment, and remove al Pull Request deployed with Helm

clean.sh

#!/usr/bin/env bash
#shellcheck disable=SC2116

TILLER_NS=$( kubectl get pods --all-namespaces --selector name=tiller --output custom-columns=:.metadata.namespace | grep -v ^$ )
export TILLER_NS

for ns in $( echo "$TILLER_NS" )
do
  helm ls --tiller-namespace "$ns" \
  | cut -f1 \
  | grep -E ".*-[0-9]*$" \
  | xargs -I RELEASE helm delete --purge RELEASE --tiller-namespace "$ns"
done