feat: added longhorn addon (#1204)

* added longhorn addon

* enabled longhorn in the tests

* fix: move longhorn to longhorn-system namespace

Signed-off-by: Devin Buhl <devin@buhl.casa>

* fix: move longhorn to longhorn-system namespace

Signed-off-by: Devin Buhl <devin@buhl.casa>

* fix: move longhorn to longhorn-system namespace

Signed-off-by: Devin Buhl <devin@buhl.casa>

* fix: move longhorn to longhorn-system namespace

Signed-off-by: Devin Buhl <devin@buhl.casa>

---------

Signed-off-by: Devin Buhl <devin@buhl.casa>
Co-authored-by: Devin Buhl <devin@buhl.casa>

bootstrap/templates/kubernetes/apps/longhorn-system/namespace.yaml.j2

@@ -0,0 +1,9 @@
+#% if longhorn.enabled | default(false) %#
+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: longhorn-system
+  labels:
+    kustomize.toolkit.fluxcd.io/prune: disabled
+#% endif %#