ci: add full-node tests (#920)

diff --git a/images/barbican/Earthfile b/images/barbican/Earthfile
index 0c843ff..5ae11d0 100644
--- a/images/barbican/Earthfile
+++ b/images/barbican/Earthfile
@@ -1,5 +1,6 @@
 VERSION 0.7
 
+ARG --global REGISTRY=ghcr.io/vexxhost/atmosphere
 ARG --global PROJECT=barbican
 ARG --global RELEASE=2023.2
 ARG --global PROJECT_REF=a00fcade4138ffc52cd9c84b5999297966f019b5
@@ -15,5 +16,5 @@
   FROM ../openstack-service+image --RELEASE ${RELEASE} --PROJECT ${PROJECT}
   COPY +build/venv /var/lib/openstack
   SAVE IMAGE --push \
-    ghcr.io/vexxhost/atmosphere/${PROJECT}:${RELEASE} \
-    ghcr.io/vexxhost/atmosphere/${PROJECT}:${PROJECT_REF}
+    ${REGISTRY}/${PROJECT}:${RELEASE} \
+    ${REGISTRY}/${PROJECT}:${PROJECT_REF}