[finishes #187354240] setting up docker for backend

[JeanIrad]

[finishes #187354240] setting up docker for backend

Purpose

setting up a docker image for our backend

Changes Made

docker-compose file and docker ignore file touched

Testing Instructions

No test required: here are instructions to run the docker image after pulling:

• install docker desktop on your machine
• pull our docker image
• run docker-compose up -d --build command to start docker container
• then start interacting with the endpoint in your postman

N.B do all this in your current working directory

Related Issues

for now, no issue

Checklist

Please review the following checklist and make sure all tasks are complete before submitting:

• [ x] Code follows the project's coding standards
• [ x] Changes are covered by tests
• [ x] Documentation is updated (if applicable)
• [x ] All tests pass