feat : use --no-cache-dir flag to pip in dockerfiles to save space (#334

)

using the "--no-cache-dir" flag in pip install, make sure downloaded
packages by pip don't cache on the system. This is a best practice that
makes sure to fetch from a repo instead of using a local cached one.
Further, in the case of Docker Containers, by restricting caching, we
can reduce image size. In terms 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 reduces a lot by don't cache pip
packages.

Further, more detailed information can be found at


https://medium.com/sciforce/strategies-of-docker-images-optimization-2ca9cc5719b6

---------

Signed-off-by: Pratik Raj <[email protected]>

Dockerfile

@@ -14,10 +14,10 @@ WORKDIR /app
 
 COPY ./requirements.txt requirements.txt
 
-RUN pip install --upgrade pip
+RUN pip install --no-cache-dir --upgrade pip
 # Install the project dependencies
 RUN python -m ensurepip --upgrade
-RUN pip install -r requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt
 
 # Copy the rest of the application code
 COPY . .

docker/aws.Dockerfile

@@ -11,7 +11,7 @@ RUN apt-get update && \
 COPY ./requirements.txt requirements.txt
 
 # Install the project dependencies
-RUN pip install -r requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt
 
 # Install curl and unzip for awscli 
 RUN apt-get -y update; apt-get -y install curl; apt-get -y install unzip