Simple patch to allow s390x images to be built

Needs integration with CI and s390x machine integration

Signed-off-by: French Ben <[email protected]>

Dockerfile.s390x

@@ -0,0 +1,6 @@
+FROM s390x/python:3.6.2-slim
+ARG COMPOSE_VERSION=1.16.1
+
+RUN pip install --no-cache-dir docker-compose==$COMPOSE_VERSION
+
+ENTRYPOINT ["docker-compose"]