[kube-prometheus-stack] fix kps deployment when thanos field is set t…

…o null (#3163)

kps deployment fails when disabling thanos sidecar by setting `prometheus.prometheusSpec.thanos` field to null due to the reference of a field in thanos object in csi-secret.yaml. This change gives the ability to disable thanos sidecar by setting `prometheus.prometheusSpec.thanos=null`

Signed-off-by: Renju <renjugeo@gmail.com>

charts/kube-prometheus-stack/Chart.yaml

@@ -21,7 +21,7 @@ name: kube-prometheus-stack
 sources:
   - https://github.com/prometheus-community/helm-charts
   - https://github.com/prometheus-operator/kube-prometheus
-version: 45.9.0
+version: 45.9.1
 appVersion: v0.63.0
 kubeVersion: ">=1.16.0-0"
 home: https://github.com/prometheus-operator/kube-prometheus

charts/kube-prometheus-stack/templates/prometheus/csi-secret.yaml

@@ -1,4 +1,4 @@
-{{- if .Values.prometheus.prometheusSpec.thanos.secretProviderClass }}
+{{- if and .Values.prometheus.prometheusSpec.thanos .Values.prometheus.prometheusSpec.thanos.secretProviderClass }}
 ---
 apiVersion: secrets-store.csi.x-k8s.io/v1alpha1
 kind: SecretProviderClass
@@ -9,4 +9,4 @@ metadata:
     app: {{ template "kube-prometheus-stack.name" . }}-prometheus
 spec:
 {{ toYaml .Values.prometheus.prometheusSpec.thanos.secretProviderClass | indent 2 }}
-{{- end }}
+{{- end }}