diff --git a/Dockerfile b/Dockerfile
index a16de70e9ab456ac347ad7069cba6e2d36f3cc8c..84cd595f5f845b36795cbbbb4dbf9719bb877038 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 ARG DOCKER_REGISTRY=registry.cyberbrain.pw
-FROM $DOCKER_REGISTRY/tools/docker/alpine:latest
+FROM $DOCKER_REGISTRY/tools/docker/alpine:latest AS runtime
 
 RUN set -ex && \
     apk --no-cache add rsync openssh-client && \
@@ -7,3 +7,5 @@ RUN set -ex && \
 
 ENTRYPOINT ["rsync"]
 CMD [ "--version" ]
+
+FROM runtime AS release