Re-add repository verification

clusters/k8s01/flux-system/gotk-sync.yaml

@@ -11,6 +11,10 @@ spec:
   secretRef:
     name: flux-system
   url: ssh://git@git.shivering-isles.com:2222/shivering-isles/infrastructure-gitops
+  verify:
+    mode: head
+    secretRef:
+      name: pgp-public-keys
 ---
 apiVersion: kustomize.toolkit.fluxcd.io/v1beta1
 kind: Kustomization