Fix-Helm-UTF8-env

[samiat4911]

Description

Closes #14979.

This PR fixes Helm deployments where non-ASCII values in environment-backed Django settings can fail at runtime because the container locale is not explicitly UTF-8.

The Helm ConfigMap now defines UTF-8 defaults for Python and the process locale:

  PYTHONUTF8: {{ ternary (index .Values.extraConfigs "PYTHONUTF8") "1" (hasKey .Values.extraConfigs "PYTHONUTF8") | quote }}
  LANG: {{ ternary (index .Values.extraConfigs "LANG") "C.UTF-8" (hasKey .Values.extraConfigs "LANG") | quote }}
  LC_ALL: {{ ternary (index .Values.extraConfigs "LC_ALL") "C.UTF-8" (hasKey .Values.extraConfigs "LC_ALL") | quote }}

The existing extraConfigs rendering was also adjusted so users can still override those values without rendering duplicate ConfigMap keys:

{{- with omit .Values.extraConfigs "PYTHONUTF8" "LANG" "LC_ALL" }}
  {{- toYaml . | nindent 2 }}
{{- end }}

Test results

Validated the Helm chart with a local Helm 3.16.4 binary:

C:\tmp\helm-3164\windows-amd64\helm.exe template defectdojo .tmp\dd-helm-validate-utf8 --show-only templates/configmap.yaml
C:\tmp\helm-3164\windows-amd64\helm.exe template defectdojo .tmp\dd-helm-validate-utf8 --show-only templates/configmap.yaml --set extraConfigs.PYTHONUTF8=0 --set extraConfigs.LANG=en_US.UTF-8 --set extraConfigs.LC_ALL=en_US.UTF-8
C:\tmp\helm-3164\windows-amd64\helm.exe lint .tmp\dd-helm-validate-utf8
git diff --check

The default render includes:

  PYTHONUTF8: "1"
  LANG: "C.UTF-8"
  LC_ALL: "C.UTF-8"

The override render preserves explicit user-provided values:

  PYTHONUTF8: "0"
  LANG: "en_US.UTF-8"
  LC_ALL: "en_US.UTF-8"

Documentation

Please update any documentation when needed in the documentation folder)

Checklist

This checklist is for your information.

• Make sure to rebase your PR against the very latest dev.
• Features/Changes should be submitted against the dev.
• Bugfixes should be submitted against the bugfix branch.
• Give a meaningful name to your PR, as it may end up being used in the release notes.
• Your code is Ruff compliant (see ruff.toml).
• Your code is python 3.13 compliant.
• If this is a new feature and not a bug fix, you've included the proper documentation in the docs at https://github.com/DefectDojo/django-DefectDojo/tree/dev/docs as part of this PR.
• Model changes must include the necessary migrations in the dojo/db_migrations folder.
• Add applicable tests to the unit tests.
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