Add kustomization.yaml for cert-manager with custom DNS settings

- Introduced a new kustomization.yaml file for cert-manager.
- Configured a patch to modify the cert-manager Deployment to use a custom DNS policy and settings.
- Set dnsPolicy to None and specified custom nameservers and search options.

cert-manager/manifest.yaml

@@ -13,3 +13,14 @@ defaultConfig:
   cloudflareDomain: "{{ .cloud.baseDomain }}"
 defaultSecrets:
   - key: cloudflareToken
+deploy:
+  phases:
+    - path: upstream
+      waitFor:
+        name: cert-manager-webhook
+        timeout: "120s"
+    - path: .
+  createSecrets:
+    - name: cloudflare-api-token
+      entries:
+        api-token: cloudflareToken