update to latest during build

Author: moelsayed

Dockerfile

@@ -1,5 +1,6 @@
 FROM gcr.io/google_containers/hyperkube:v1.16.1
 RUN sed -i -e 's!\bmain\b!main contrib!g' /etc/apt/sources.list && \
+    apt-get update && apt-get upgrade -y && apt-get clean && \
     clean-install apt-transport-https gnupg1 curl zfsutils-linux \
     && echo "deb [arch=amd64] https://packages.microsoft.com/repos/azure-cli/ stretch main" > \
     /etc/apt/sources.list.d/azure-cli.list \

Dockerfile.arm64

@@ -1,5 +1,6 @@
 FROM gcr.io/google_containers/hyperkube-arm64:v1.16.1
 RUN sed -i -e 's!\bmain\b!main contrib!g' /etc/apt/sources.list && \
+    apt-get update && apt-get upgrade -y && apt-get clean && \
     clean-install apt-transport-https gnupg1 curl zfsutils-linux \
     && apt-get purge gnupg \
     && clean-install \