CI: helm-ci job is broken

[trevorwhitney]

Installing the prometheus-operator during the helm tests is failing

Run kubectl create namespace prometheus
  kubectl create namespace prometheus
  
  helm install prometheus prometheus-community/kube-prometheus-stack \
    --namespace prometheus \
    --set grafana.enabled=false \
    --set prometheus.prometheusSpec.serviceMonitorSelector.matchLabels.release=prometheus
  
  kubectl --namespace prometheus get pods -l "release=prometheus"
  kubectl --namespace prometheus get services -l "release=prometheus"
  shell: /usr/bin/bash -e {0}
  env:
    CT_CONFIGFILE: production/helm/ct.yaml
    pythonLocation: /opt/hostedtoolcache/Python/3.7.17/x64
    PKG_CONFIG_PATH: /opt/hostedtoolcache/Python/3.7.17/x64/lib/pkgconfig
    Python_ROOT_DIR: /opt/hostedtoolcache/Python/3.7.17/x64
    Python[2](https://github.com/grafana/loki/actions/runs/11700514101/job/32584671496#step:9:2)_ROOT_DIR: /opt/hostedtoolcache/Python/[3](https://github.com/grafana/loki/actions/runs/11700514101/job/32584671496#step:9:3).7.17/x6[4](https://github.com/grafana/loki/actions/runs/11700514101/job/32584671496#step:9:4)
    Python3_ROOT_DIR: /opt/hostedtoolcache/Python/3.7.17/x64
    LD_LIBRARY_PATH: /opt/hostedtoolcache/Python/3.7.17/x[6](https://github.com/grafana/loki/actions/runs/11700514101/job/32584671496#step:9:6)4/lib
    CT_CONFIG_DIR: /opt/hostedtoolcache/ct/3.10.1/amd64/etc
    VIRTUAL_ENV: /opt/hostedtoolcache/ct/3.10.1/amd64/venv
namespace/prometheus created
Error: INSTALLATION FAILED: template: kube-prometheus-stack/templates/prometheus/prometheus.yaml:262:[11](https://github.com/grafana/loki/actions/runs/11700514101/job/32584671496#step:9:11): executing "kube-prometheus-stack/templates/prometheus/prometheus.yaml" at <ne .Values.prometheus.prometheusSpec.scrapeConfigNamespaceSelector nil>: error calling ne: uncomparable type map[string]interface {}: map[]

This is blocking all helm PRs and releases.

[morganrowse]

I woke up early to try tackle this but you beat me to it. Much appreciated @trevorwhitney, thank you for the contribution to OSS!

[trevorwhitney]

We should have created an issue sooner, thanks for the offer @morganrowse! It was becoming a big of a problem I decided to prioritize it at the end of my day yesterday, but I'll keep you in mind for next time 😄