Add OVN BGP Agent image build

Co-Authored-By: Dong Ma <dong.ma@vexxhost.com>
Change-Id: I53a3d4d126a47d875b23a50d3218c41f31bdd053
diff --git a/docker-bake.hcl b/docker-bake.hcl
index cb068e3..ee40793 100644
--- a/docker-bake.hcl
+++ b/docker-bake.hcl
@@ -215,6 +215,7 @@
             "neutron",
             "nova",
             "octavia",
+            "ovn-bgp-agent",
             "placement",
             "staffeln",
             "tempest",
@@ -259,6 +260,7 @@
         "openstack-neutron",
         "openstack-nova",
         "openstack-octavia",
+        "openstack-ovn-bgp-agent",
         "openstack-placement",
         "openstack-staffeln",
         "openstack-tempest",