feat: only store cluster-issuers in core kustomization

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

cluster/apps/cert-manager/helm-release.yaml

@@ -0,0 +1,36 @@
+---
+apiVersion: helm.toolkit.fluxcd.io/v2beta1
+kind: HelmRelease
+metadata:
+  name: cert-manager
+  namespace: cert-manager
+spec:
+  interval: 5m
+  chart:
+    spec:
+      chart: cert-manager
+      version: v1.8.0
+      sourceRef:
+        kind: HelmRepository
+        name: jetstack
+        namespace: flux-system
+  install:
+    createNamespace: true
+    remediation:
+      retries: 3
+  upgrade:
+    remediation:
+      retries: 3
+  values:
+    installCRDs: false
+    webhook:
+      enabled: true
+    extraArgs:
+      - --dns01-recursive-nameservers=1.1.1.1:53,9.9.9.9:53
+      - --dns01-recursive-nameservers-only
+    replicaCount: 1
+    podDnsPolicy: "None"
+    podDnsConfig:
+      nameservers:
+        - "1.1.1.1"
+        - "9.9.9.9"