Add value option to define schedulerName (#150)

For those who have a need to configure the schedulerName like us, make this an option just as it is for example in the postgres chart

Co-authored-by: Dimitri Ars <dimitri.ars@kpn.com>
Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/150
Reviewed-by: luhahn <luhahn@noreply.gitea.io>
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: mrdima <mrdima@noreply.gitea.io>
Co-committed-by: mrdima <mrdima@noreply.gitea.io>

templates/gitea/statefulset.yaml

@@ -28,6 +28,9 @@ spec:
         {{- toYaml .Values.statefulset.labels | nindent 8 }}
         {{- end }}
     spec:
+      {{- if .Values.schedulerName }}
+      schedulerName: "{{ .Values.schedulerName }}"
+      {{- end }}
       {{- with .Values.imagePullSecrets }}
       imagePullSecrets:
         {{- toYaml . | nindent 8 }}