feat: dockerise gentropy python package

[ireneisdoomed]

🛠 What does this PR implement

Dockerfile to dockerise the python application. Image can be built using:

docker build . --tag gentropy_app

Steps can be run using:

docker run gentropy_app

🙈 Missing

• Slimming down the image size
• Github action to automatically build the image
• Unit test image build is correct

🚦 Before submitting

• Do these changes cover one single feature (one change at a time)?
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• Did you write any new necessary tests?
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