write you own-values.yml
helm repo add wakapi https://andreymaznyak.github.io/wakapi-helm-chart/
helm repo update
helm install -f own-values.yml wakapi-app wakapi/wakapi
write you own values.yaml and install with helm:
git clone https://github.com/andreymaznyak/wakapi-helm-chart
cd wakapi-helm-chart
helm install -f own-values.yml wakapi-app ./charts/wakapi