Add missing Senlin image build

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Change-Id: I56cd20c5cf8f24fa0ac1b845c3665a481629e03e
diff --git a/docker-bake.hcl b/docker-bake.hcl
index fb1b0fe..bc04d96 100644
--- a/docker-bake.hcl
+++ b/docker-bake.hcl
@@ -203,6 +203,7 @@
             "nova",
             "octavia",
             "placement",
+            "senlin",
             "staffeln",
             "tempest",
         ]
@@ -246,6 +247,7 @@
         "openstack-nova",
         "openstack-octavia",
         "openstack-placement",
+        "openstack-senlin",
         "openstack-staffeln",
         "openstack-tempest",
         "openvswitch",