Revert "remove nextcloud"

This reverts commit 7fc16afa59.

bootstrap/kustomizations/kustomization-nextcloud.yaml

@@ -0,0 +1,18 @@
+apiVersion: kustomize.toolkit.fluxcd.io/v1
+kind: Kustomization
+metadata:
+  name: nextcloud
+  namespace: flux-system
+spec:
+  interval: 15m
+  path: ./nextcloud
+  prune: true # remove any elements later removed from the above path
+  timeout: 2m # if not set, this defaults to interval duration, which is 1h
+  sourceRef:
+    kind: GitRepository
+    name: flux-system
+  healthChecks:
+    - apiVersion: helm.toolkit.fluxcd.io/v2beta1
+      kind: HelmRelease
+      name: nextcloud
+      namespace: nextcloud