Wait for cert-manager kustomization

.gitlab/ci_scripts/install_zerossl_issuer.sh

@@ -13,7 +13,7 @@ b64secret=$(echo -n "${ZEROSSL_EAB_HMAC_KEY}" | base64 -w0)
 b64tlskey=$(echo -n "${ZEROSSL_TLS_KEY}" | base64 -w0)
 
 # Wait until cert-manager is ready
-"$(dirname "$0")/retry_cmd_until_success.sh" 30 10 "flux get kustomization --status-selector ready=true --no-header | grep '^core'"
+"$(dirname "$0")/retry_cmd_until_success.sh" 30 10 "flux get kustomization --status-selector ready=true --no-header | grep 'cert-manager'"
 
 # Add ZeroSSL ClusterIssuer
 kubectl apply -n cert-manager -f - <<EOF