Add OVN BGP Agent image build

Co-Authored-By: Dong Ma <dong.ma@vexxhost.com>
Change-Id: I53a3d4d126a47d875b23a50d3218c41f31bdd053
diff --git a/src/bin/imagebumper.rs b/src/bin/imagebumper.rs
index 9958331..c924a7a 100644
--- a/src/bin/imagebumper.rs
+++ b/src/bin/imagebumper.rs
@@ -108,6 +108,10 @@
         Repository::from_url(clientset, "https://opendev.org/openstack/requirements.git").unwrap(),
     );
     map.insert(
+        "OVN_BGP_AGENT_GIT_REF",
+        Repository::from_url(clientset, "https://opendev.org/openstack/ovn-bgp-agent.git").unwrap(),
+    );
+    map.insert(
         "PLACEMENT_GIT_REF",
         Repository::from_url(clientset, "https://opendev.org/openstack/placement.git").unwrap(),
     );