Run tests against docker container

## User Story
As a developer
When the tests are run in the CI workflow
I want them to be executed against a version of the code running in a docker container of the build that is about to be deployed.

This should speed up the pipeline because the docker image is build anyway, so no need to install the same software again in the CI environment.

## Acceptance Criteria
GIVEN I am a developer
WHEN I trigger the CI pipeline
THEN I want the tests to be executed against a version of the code running in a docker container of the build that is about to be deployed

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