Description of the change

Introduces .loki.overrideConfiguration which allows users to specify specific configuration overrides via yaml. This augments the sane defaults provided in loki.configuration of the current values.yaml

E.g.

loki:
  configuration: |
    auth_enabled: false
    ...
  overrideConfiguration:
    auth_enabled: true

will yield the following in grafana-loki/templates/loki-configmap.yaml

data:
  loki.yaml: |-
    auth_enabled: true

Benefits

This allows better customization of Loki"s configuration while making use of the sane defaults provided.

Possible drawbacks

Long and complex Helm templating.

{{- mergeOverwrite (include "common.tplvalues.render" (dict "value" .Values.loki.configuration "context" $) | fromYaml) .Values.loki.overrideConfiguration | toYaml | nindent 4 }}

Any better ideas?

Applicable issues

Resolves #12400

Additional information

Checklist

• Chart version bumped in Chart.yaml according to semver. This is not necessary when the changes only affect README.md files.
• Variables are documented in the values.yaml and added to the README.md using readme-generator-for-helm
• Title of the pull request follows this pattern [bitnami/<name_of_the_chart>] Descriptive title
• All commits signed off and in agreement of Developer Certificate of Origin (DCO)