Fix for #203 possible existingClaim at persistence with namespace variable in the name (#204)

Fix for #203

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/204
Reviewed-by: luhahn <luhahn@noreply.gitea.io>
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: skriesch <skriesch@noreply.gitea.io>
Co-committed-by: skriesch <skriesch@noreply.gitea.io>

templates/gitea/statefulset.yaml

@@ -244,7 +244,9 @@ spec:
   {{- if and .Values.persistence.enabled .Values.persistence.existingClaim }}
         - name: data
           persistentVolumeClaim:
-            claimName: {{ .Values.persistence.existingClaim }}
+  {{- with .Values.persistence.existingClaim }}
+            claimName: {{ tpl . $ }}
+  {{- end }}
   {{- else if not .Values.persistence.enabled }}
         - name: data
           emptyDir: {}