Added a dockerfile for easy running of examples.

[BenjaminDev]

Description

Following a slack conversation there was a desire for a simple way to run the PyDP examples. It's a minimal docker image with the example dependencies and jupyter installed.

Summary added to readme:

Docker alternative

To run the examples in a container:

1. cd PyDP/examples
2. docker build -t pydp-sandbox:local .
3. docker run -p 8899:8899 pydp-sandbox:local
4. Open displayed url in a browser.

Affected Dependencies

None.

How has this been tested?

Tested on my local machine following the examples/readme.md

Checklist

• I have followed the Contribution Guidelines and Code of Conduct
• I have commented my code following the OpenMined Styleguide
• I have labeled this PR with the relevant Type labels
• My changes are covered by tests

[chinmayshah99]

Can we add this to when we publish it on docker hub?
We can the previous one as dev image and this as sandbox image?

[BenjaminDev]

Can we add this to when we publish it on docker hub?
We can the previous one as dev image and this as sandbox image?

Sure that is not a problem 😀

However, asking the user to build the image is a one-liner docker build -t pydp-sandbox:local .. I guess the question is which is easier for the user:
a)
docker build -t pydp-sandbox:local .
docker run -p 8899:8899 pydp-sandbox:local
or
b)
docker run -p 8899:8899 openmined/pydp-sandbox:latest

I am in favor of a) as it's done. If we opt for b) then I'd like to try shrink the image some more. As pandas alone uses ~96MB. I'm sure a few flags like --no-cache will do the trick.

I'll work on b) in the next few days. For now users can be pointed to solution a).

[chinmayshah99]

People using Sandbox will be directly doing docker pull rather than docker build. So we need to minimize the docker file size!

[chinmayshah99]

What base image do you have in mind?