ci: add full-node tests (#920)

diff --git a/images/keystone/Earthfile b/images/keystone/Earthfile
index 7aae428..25f2532 100644
--- a/images/keystone/Earthfile
+++ b/images/keystone/Earthfile
@@ -1,5 +1,6 @@
 VERSION 0.7
 
+ARG --global REGISTRY=ghcr.io/vexxhost/atmosphere
 ARG --global RELEASE=2023.2
 ARG --global PROJECT=keystone
 ARG --global PROJECT_REF=653d82b1b4e09b2ff37b56868e57d08c8e3af7dd
@@ -29,5 +30,5 @@
     apt-get clean && \
     rm -rfv /var/lib/apt/lists/* libapache2-mod-auth-openidc_${MOD_AUTH_OPENIDC_VERSION}-1.$(lsb_release -sc)_${TARGETARCH}.deb
   SAVE IMAGE --push \
-    ghcr.io/vexxhost/atmosphere/${PROJECT}:${RELEASE} \
-    ghcr.io/vexxhost/atmosphere/${PROJECT}:${PROJECT_REF}
+    ${REGISTRY}/${PROJECT}:${RELEASE} \
+    ${REGISTRY}/${PROJECT}:${PROJECT_REF}