stable/prometheus is DEPRECATED and moved

https://github.com/helm/charts/tree/master/stable/prometheus

DEPRECATED and moved to https://github.com/prometheus-community/helm-charts

Therefore, in applications/prometheus/helmfile.yaml replace

  chart: stable/prometheus
  version: 10.4.1

with

  chart: prometheus-community/prometheus
  version: 15.0.2

or another new version.

I also had to add the repo via helm repo add prometheus-community https://prometheus-community.github.io/helm-charts when running locally. However, it worked fine in a pipeline