update dockerfile..

Author: alex.liang

docker/arm64v8/Dockerfile

@@ -2,6 +2,7 @@ FROM arm64v8/ubuntu:20.04
 
 
 ARG DEBIAN_FRONTEND=noninteractive
+RUN echo "nameserver 8.8.8.8" > /etc/resolv.conf
 RUN apt-get clean
 RUN apt-get --allow-downgrades update
 RUN apt-get -f install -y --no-install-recommends \

docker/x86-64/Dockerfile

@@ -58,12 +58,9 @@ RUN mkdir -p ${WORKSPACE}
 # Python
 # ***************************************************************************
 ARG DEBIAN_FRONTEND=noninteractive
-RUN echo "nameserver 8.8.8.8" >> /etc/resolv.conf
-RUN apt-get update
-RUN cat /etc/apt/sources.list
-RUN apt-get install software-properties-common
-RUN add-apt-repository universe
-RUN cat /etc/apt/sources.list
+RUN echo "nameserver 8.8.8.8" > /etc/resolv.conf
+RUN apt-get clean
+RUN apt-get --allow-downgrades update
 RUN apt-get install -y python3 python3-pip
 RUN ln -s /usr/bin/python3 /usr/bin/python
 RUN ln -nsf /usr/bin/pip3 /usr/bin/pip