commit e4dd6597c437dbcc390c31bcc48c52192a83df5c
Author: Pratik Raj <rajpratik71@gmail.com>
Date:   Sat Oct 3 12:18:43 2020 +0530

    optimize size and time using --no-cache-dir
    
    Using --no-cache-dir flag in pip install ,make sure dowloaded packages
    by pip don't cached on system . This is a best practise which make sure
    to fetch ftom repo instead of using local cached one . Further , in case
    of Docker Containers , by restricing caching , we can reduce image size.
    In term of stats , it depends upon the number of python packages
    multiplied by their respective size . e.g for heavy packages with a lot
    of dependencies it reduce a lot by don't caching pip packages.
    
    Further , more detail information can be found at
    
    https://medium.com/sciforce/strategies-of-docker-images-optimization-2ca9cc5719b6
    
    Change-Id: If206e41f3bac6e0b73b57e85c80fa2530ee9d4cf
    Signed-off-by: Pratik Raj <rajpratik71@gmail.com>

diff --git a/Dockerfile b/Dockerfile
index f9bd78a..267e070 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@ RUN sed -i s/^deb-src.*// /etc/apt/sources.list
 
 RUN apt-get update && apt-get install --yes sudo python3-dev python3-pip vim git-core && \
     apt clean && \
-    pip3 install --upgrade pip setuptools && \
+    pip3 --no-cache-dir install --upgrade pip setuptools && \
     useradd -u 65500 -m rally && \
     usermod -aG sudo rally && \
     echo "rally ALL=(ALL) NOPASSWD:ALL" > /etc/sudoers.d/00-rally-user && \