use ubuntu-slim where possible

[gruebel]

What does this PR do?

What gif best describes this PR or how it makes you feel?

Completion checklist

• Additions and changes have unit tests
• pre-commit hooks and tests are passing
• The pull request has been appropriately labeled using the provided PR labels
• If the UI contents or JavaScript files have been modified, generate a new example report:

# Generate the updated Javascript bundle
just build-js

# Generate the example report
just generate-report