Use multistage to reduce test image size

[hmzakhalid]

Uses a multistage build to reduce the Docker image size from 3.5 GB to 100 MB for #184 .
I also noticed that it was creating three separate images for the same build because each service in the Docker Compose file had its own build context. Instead, only one image should be built and shared across all the services, with each service simply instantiating its own container from that shared image.

Building the image first and then referencing it in the services resolves this issue.

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