feat: move namespaces defs into apps and utilize fluxcd.io/prune label

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

cluster/apps/networking/metallb/helm-release.yaml

@@ -0,0 +1,30 @@
+---
+apiVersion: helm.toolkit.fluxcd.io/v2beta1
+kind: HelmRelease
+metadata:
+  name: metallb
+  namespace: networking
+spec:
+  interval: 5m
+  chart:
+    spec:
+      chart: metallb
+      version: 0.12.1
+      sourceRef:
+        kind: HelmRepository
+        name: metallb
+        namespace: flux-system
+  install:
+    createNamespace: true
+    remediation:
+      retries: 3
+  upgrade:
+    remediation:
+      retries: 3
+  values:
+    configInline:
+      address-pools:
+        - name: default
+          protocol: layer2
+          addresses:
+            - "${METALLB_LB_RANGE}"

cluster/apps/networking/metallb/kustomization.yaml

@@ -0,0 +1,5 @@
+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - helm-release.yaml