### Description of the change Adding support for DRY principle (via use of the TPL function) to the PVC storage class and the ingress class ### Benefits It allows to reference a variable into another one to avoid duplicating them (or using YAML anchors). It is useful and valuable when including Gitea into an umbrella chart with multiple components and to have a single variable while the components variable only refer to that single one. Example 1 ``` global: persistence: storageClass: "storage-class" persistence: storageClass: "{{ .Values.global.persistence.storageClass }}" ``` This results in having `spec.storageClassName` equal to `storage-class` in the PVC object Example 2 ``` global: ingress: className: "ingress-class" ingress: className: "{{ .Values.global.ingress.className}}" ``` This results in having `spec.ingressClassName` equal to `ingress-class` in the Ingress object ### Possible drawbacks N/A ### Checklist - [X] Templating unittests are added Co-authored-by: 212597596 <cedric.henry@ge.com> Co-authored-by: pat-s <pat-s@noreply.gitea.com> Co-authored-by: justusbunsi <justusbunsi@noreply.gitea.com> Reviewed-on: gitea/helm-chart#664 Reviewed-by: pat-s <pat-s@noreply.gitea.com> Co-authored-by: Ceddaerrix <ceddaerrix@noreply.gitea.com> Co-committed-by: Ceddaerrix <ceddaerrix@noreply.gitea.com>