Add Velero and snapshot controller for backups

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

docs/kubernetes/backup/csi-snapshots/snapshot-validation-webhook.md

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+---
+title: Prepare for snapshot-controller with snapshot validation webhook
+description: Prepare your Kubernetes cluster for CSI snapshot support with snapshot validation webhook
+values_yaml_url: https://github.com/piraeusdatastore/helm-charts/blob/main/charts/snapshot-validation-webhook/values.yaml
+helm_chart_version: 1.8.x
+helm_chart_name: snapshot-validation-webhook
+helm_chart_repo_name: piraeus-charts
+helm_chart_repo_url: https://piraeus.io/helm-charts/
+helmrelease_name: snapshot-validation-webhook
+helmrelease_namespace: snapshot-validation-webhook
+kustomization_name: snapshot-validation-webhook
+slug: Snapshot Validation Webhook
+status: new
+---
+
+# Prepare for CSI snapshots with the snapshot validation webhook
+
+Before we deploy snapshot-controller to actually **manage** the snapshots we take, we need the validation webhook to make sure it's done "right".
+
+## {{ page.meta.slug }} requirements
+
+!!! summary "Ingredients"
+
+    Already deployed:
+
+    * [x] A [Kubernetes cluster](/kubernetes/cluster/)
+    * [x] [Flux deployment process](/kubernetes/deployment/flux/) bootstrapped
+
+{% include 'kubernetes-flux-namespace.md' %}
+{% include 'kubernetes-flux-helmrepository.md' %}
+{% include 'kubernetes-flux-kustomization.md' %}
+{% include 'kubernetes-flux-helmrelease.md' %}
+{% include 'kubernetes-flux-check.md' %}
+
+## Summary
+
+What have we achieved? We now have the snapshot validation admission webhook running in the cluster, ready to support [snapshot-controller](/kubernetes/backup/csi-snapshots/snapshot-controller/)!
+
+!!! summary "Summary"
+    Created:
+
+    * [X] snapshot-validation-webhook running and ready to validate!
+
+    Next:
+
+    * [ ] Deploy [snapshot-controller]( (/kubernetes/backup/csi-snapshots/snapshot-controller/)) itself
+
+--8<-- "recipe-footer.md"