feat(cluster): use LE staging env for initial setup

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

tmpl/cluster/flux-system/webhooks/github/ingress.yaml

@@ -5,7 +5,7 @@ metadata:
   name: webhook-receiver
   namespace: flux-system
   annotations:
-    cert-manager.io/cluster-issuer: "letsencrypt-production"
+    cert-manager.io/cluster-issuer: "letsencrypt-staging"
     external-dns/is-public: "true"
     external-dns.alpha.kubernetes.io/target: "ipv4.${SECRET_DOMAIN}"
     traefik.ingress.kubernetes.io/router.middlewares: "networking-cloudflare-only@kubernetescrd"