`registry.existingSecret` is only set on `registryctl` container, not `registry`.

[felixscheinost]

This block:

harbor-helm/templates/registry/registry-dpl.yaml

Lines 203 to 209 in 626d8e3

	{{- if .Values.registry.existingSecret }}
	- name: REGISTRY_HTTP_SECRET
	valueFrom:
	secretKeyRef:
	name: {{ .Values.registry.existingSecret }}
	key: {{ .Values.registry.existingSecretKey }}
	{{- end }}

Is missing for the registry container.