Merge pull request #641 from RedisAI/buid_onnx_on_xenial

Build onnx on ubuntu 16 instead of buster

Author: alonre24

opt/build/onnxruntime/Dockerfile.x64

@@ -1,6 +1,6 @@
 # BUILD redisfab/onnxruntime-x64-${OS}:$(ONNXRUNTIME_VER)
 
-ARG OS=debian:buster
+ARG OS=ubuntu:16.04
 
 #----------------------------------------------------------------------------------------------
 FROM ${OS}