Start migration of helm chart (#5159)

charts/ingress-nginx/templates/default-backend-psp.yaml

@@ -0,0 +1,35 @@
+{{- if and .Values.podSecurityPolicy.enabled .Values.defaultBackend.enabled -}}
+apiVersion: {{ template "podSecurityPolicy.apiVersion" . }}
+kind: PodSecurityPolicy
+metadata:
+  name: {{ template "nginx-ingress.fullname" . }}-backend
+  labels:
+    app: {{ template "nginx-ingress.name" . }}
+    chart: {{ template "nginx-ingress.chart" . }}
+    heritage: {{ .Release.Service }}
+    release: {{ .Release.Name }}
+spec:
+  allowPrivilegeEscalation: false
+  fsGroup:
+    ranges:
+    - max: 65535
+      min: 1
+    rule: MustRunAs
+  requiredDropCapabilities:
+  - ALL
+  runAsUser:
+    rule: MustRunAsNonRoot
+  seLinux:
+    rule: RunAsAny
+  supplementalGroups:
+    ranges:
+    - max: 65535
+      min: 1
+    rule: MustRunAs
+  volumes:
+  - configMap
+  - emptyDir
+  - projected
+  - secret
+  - downwardAPI
+{{- end -}}