remove the polycube source code from the base image

Author: goldenrye

Dockerfile_base_image

@@ -1,7 +1,7 @@
 # syntax = tonistiigi/dockerfile:runmount20180618
 FROM ubuntu:18.04
-RUN --mount=target=/polycube cp -r /polycube /tmp/polycube && \
-cd /tmp/polycube && \
-SUDO="" WORKDIR="/tmp/dev" \
+COPY scripts/pre-requirements.sh /tmp/
+RUN cd /tmp/ && \
 apt update && \
-./scripts/pre-requirements.sh
+SUDO="" WORKDIR="/tmp/dev" ./pre-requirements.sh && \
+rm -f /tmp/pre-requirements.sh

scripts/pre-requirements.sh

@@ -5,7 +5,7 @@ then
 fi
 mkdir -p $WORKDIR
 
-$SUDO sudo apt update
+$SUDO apt update
 $SUDO bash -c "apt install --allow-unauthenticated -y wget gnupg2 software-properties-common"
 
 # golang v1.12 still not available in repos