Add production docker-compose.yml for the backend

Change-Id: Iea13f31fcb0887f4b8dad4c36dec5a434df0c673
diff --git a/docker/envoy/Dockerfile b/docker/envoy/Dockerfile
new file mode 100644
index 0000000..a2c877b
--- /dev/null
+++ b/docker/envoy/Dockerfile
@@ -0,0 +1,5 @@
+FROM envoyproxy/envoy:v1.18-latest
+
+COPY envoy.yaml /etc/envoy/envoy.yaml
+
+CMD /usr/local/bin/envoy -c /etc/envoy/envoy.yaml -l trace --log-path /tmp/envoy_info.log