deploy-templates/templates/ConfigMaps/external-systems-endpoint-configuration.yaml

{{- $configMap := (lookup "v1" "ConfigMap" .Release.Namespace .Values.registryConfigs.externalSystemsEndpointConfigurationName) }}
kind: ConfigMap
apiVersion: v1
metadata:
  name: {{ .Values.registryConfigs.externalSystemsEndpointConfigurationName }}
{{- if $configMap }}
data:
{{ $configMap.data | toYaml | nindent 2 }}
{{- else }}
data:
  external-systems-endpoint-configuration.yml: |
    external-systems: {}
{{- end -}}