Adding Velero

Summary

Velero will be used as part of our blue-green strategy for our DSOP clusters on the low side and for mission apps on the high side.

Relevant logs/screenshots

N/A

/cc @joshwolf @runyontr

chart/templates/velero/gitrepository.yaml

+{{- if and .Values.istio.enabled .Values.addons.authservice.enabled  }}
+apiVersion: source.toolkit.fluxcd.io/v1beta1
+kind: GitRepository
+metadata:
+  name: velero
+  namespace: {{ .Release.Namespace }}
+  labels:
+    app.kubernetes.io/name: velero
+    app.kubernetes.io/component: "core"
+    {{- include "commonLabels" . | nindent 4}}
+spec:
+  interval: {{ .Values.flux.interval }}
+  url: {{ .Values.addons.velero.git.repo }}
+  ref:
+    {{- include "validRef" .Values.addons.velero.git | nindent 4 }}
+  {{ include "gitIgnore" . }}
+  {{- include "gitCreds" . | nindent 2 }}
+{{- end }}