CODEOWNERS: Assign ztunnel workflows to ztunnel

Signed-off-by: Joe Stringer <joe@cilium.io>

Author: joestringer

CODEOWNERS

@@ -267,6 +267,7 @@
 /.github/workflows/*ipsec*.yaml @cilium/ipsec @cilium/github-sec @cilium/ci-structure
 /.github/workflows/*ingress*.yaml @cilium/sig-servicemesh @cilium/github-sec @cilium/ci-structure
 /.github/workflows/*kpr*.yaml @cilium/sig-datapath @cilium/github-sec @cilium/ci-structure
+/.github/workflows/*ztunnel*.yaml @cilium/ztunnel @cilium/github-sec @cilium/ci-structure
 /.github/actions/cl2-modules/ @cilium/sig-scalability
 /.github/actions/cl2-modules/l7 @cilium/envoy @cilium/sig-scalability
 /.github/workflows/*scale*.yaml @cilium/sig-scalability @cilium/github-sec @cilium/ci-structure