chore: reduce the number of layers in docker image

[leaexplores]

Purpose

Reduce the number of layer in a docker image will result in a smaller docker image filesize

Why ?

When doing RUN commands, each of them will create a new layer on the docker file system which will

• Increase the image size (Hence more storage cost for images and disk space used)
• Make the build a little slower

Note

I didn't combine the poetry build statement as we want still to have incremental rebuild when doing new builds, the ADD statement caches the file and won't run the sub-sequent RUN command if nothing has changed

[isra17]

Look good to me, thanks for the contribution!