Improve dockerization

[Mbaoma]

Description

• I updated the Dockerfile to use multistage build to reduce image build time when the docker-compose up --build command is run.

This PR fixes #
My pull request reduced the duration of the Run the Build job in the pipeline from 6 minutes and 15 seconds to 2 minutes and 8 seconds.

Notes for Reviewers

Signed commits

• Yes, I signed my commits.

[GregSutcliffe]

This looks pretty good to me for the most part - however, it looks like the dependency scripts (RUN ./scripts/docker/install-workers-deps.sh and RUN ./scripts/docker/install-go.sh) are no longer being run? I can see you are calling a chmod on them, but they no longer appear as a RUN - that might account for the speedup?

[Mbaoma]

@GregSutcliffe Thank you for catching that! Yes, that accounts for the speedup, as those scripts are typically resource-intensive. However, upon review, I ran the installation scripts in the runtime stage, to ensure the dependencies are installed before the application starts.