feat(chart/supervisor): expose extraVolumes / extraVolumeMounts

[ConProgramming]

Summary

Adds supervisor.extraVolumes / supervisor.extraVolumeMounts Helm values, matching the existing pattern on webapp and electric. Lets operators mount enterprise CA bundles, custom config files, etc. into the supervisor container without forking the chart.

~10 lines of YAML. Pure additive.

Notes

• PR 8 of 8 from a fork rebase. Final follow-up; closes out Eric's review.

Made with Cursor

[ConProgramming]

Hardened the newly-exposed supervisor.extraVolumes / supervisor.extraVolumeMounts consumers to tolerate both a structured list and a YAML block-scalar string:

{{- with.Values.supervisor.extraVolumes }}
{{- if kindIs "string". }}
{{- tpl .$| nindent 8 }}
{{- else }}
{{- tpl (toYaml .) $| nindent 8 }}
{{- end }}
{{- end }}

Why: when the field is supplied as a YAML block-scalar string containing {{ include ... }} helpers (as our umbrella chart feeds them), toYaml of a string re-emits a literal | block indicator, which corrupts the volumes:/volumeMounts: list and makes helm template fail with did not find expected '-' indicator. The kindIs "string" guard renders the string straight through tpl . $.

Upstream-mergeability: lists still render identically (the else branch is unchanged), so this is a non-breaking robustness improvement that only adds templated-string support.

Verified with helm template both ways (structured list and block-scalar string with an embedded {{ .Release.Name }}): both render valid YAML with no parse error.