feat: Run django tests

[jonandernovella]

Related issue(s) and PR(s)

This PR closes #16

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other

List of changes made

• Added minimal action to run unit tests

Testing

• Check the actions tab of the PR and make sure the tests pass

Definition of Done checklist

• I have made an effort making the commit history understandable
• I have performed a self-review of my own code and commented any hard-to-understand areas
• Tests and lint/format validations are passing
• My changes generate no new warnings
• Make sure layout and text follows design sketches, if there are any

[jhagberg]

The AC is not fulfilled here.

Please demonstrate a failing test run also as agreed

[jonandernovella]

@jhagberg Here is the link to the failing action: https://github.com/NBISweden/mimir/actions/runs/6262424722/job/17004552372