feat: Added barman cloud plugin

controllers/barman-cloud-plugin/barman-cloud-plugin.yaml

@@ -0,0 +1,17 @@
+apiVersion: kustomize.toolkit.fluxcd.io/v1
+kind: Kustomization
+metadata:
+  name: barman-cloud-plugin
+  namespace: flux-system
+spec:
+  interval: 1h
+  retryInterval: 2m
+  timeout: 5m
+  dependsOn:
+    - name: cnpg
+  sourceRef:
+    kind: ExternalArtifact
+    name: barman-cloud-plugin
+  path: .
+  prune: true
+  wait: true

controllers/barman-cloud-plugin/kustomization.yaml

@@ -0,0 +1,4 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - https://github.com/cloudnative-pg/plugin-barman-cloud/releases/download/v0.9.0/manifest.yaml