Ignore changes to CRD conversion webhook CA bundles

The metallb controller manages that field, so we need to ensure
that those changes aren't reverted by ArgoCD.

This commit configures ArgoCD to ignore changes to the conversion
webhook CA bundles.

component/app.jsonnet

@@ -3,7 +3,19 @@ local inv = kap.inventory();
 local params = inv.parameters.metallb;
 local argocd = import 'lib/argocd.libjsonnet';
 
-local app = argocd.App('metallb', params.namespace);
+local app = argocd.App('metallb', params.namespace) {
+  spec+: {
+    ignoreDifferences: [
+      {
+        group: 'apiextensions.k8s.io',
+        kind: 'CustomResourceDefinition',
+        jsonPointers: [
+          '/spec/conversion/webhook/clientConfig/caBundle',
+        ],
+      },
+    ],
+  },
+};
 
 {
   metallb: app,