Add Velero and snapshot controller for backups

Signed-off-by: David Young <davidy@funkypenguin.co.nz>

_includes/kubernetes-flux-helmrepository.md

@@ -0,0 +1,14 @@
+### HelmRepository
+
+We're going to install a helm chart from the [{{ page.meta.helm_chart_repo_name }}]({{ page.meta.helm_chart_repo_url }}) repository, so I create the following in my flux repo (*assuming it doesn't already exist*):
+
+```yaml title="/bootstrap/helmrepositories/helmrepository-{{ page.meta.helm_chart_repo_name }}.yaml"
+apiVersion: source.toolkit.fluxcd.io/v1beta1
+kind: HelmRepository
+metadata:
+  name: {{ page.meta.helm_chart_repo_name }}
+  namespace: flux-system
+spec:
+  interval: 15m
+  url: {{ page.meta.helm_chart_repo_url }}
+```