Create a production Docker image

[VKTB]

Description

This PR refactors the Dockerfile so there is a dev stage that can be used to build an image for local development and a prod stage that can be used to build an image for production. It also adds a new docker job to the GitHub Actions CI file to build the production image and if the workflow is manually triggered while the push-docker-image-to-harbor input is set to true, to push it to Harbor.

Testing instructions

• Review code
• Check Actions build
• Review changes to test coverage

Agile board tracking

connect to #5

[VKTB]

I manually triggered the workflow so there is now a production Docker image available on Harbor.

[joelvdavies]

Works for me locally and I can see it pushed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.57%. Comparing base (eccc758) to head (4a58d43).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #107   +/-   ##
========================================
  Coverage    99.57%   99.57%           
========================================
  Files           19       19           
  Lines          468      468           
========================================
  Hits           466      466           
  Misses           2        2           

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