Resolve "Exercise 3 - Scaling: Mandatory features"

Closes #17 (closed)

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requested review from @strokh24

assigned to @gajesh24

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• f5c5b005 - feat: add support for horizontal scaling with multiple back-end instances in docker-compose

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Now we are able to access via http://localhost:3001/ and via http://localhost:3002/ and the changes made are reflected in the other one.

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merged

mentioned in commit 13f79cc7