add Node 18 image

[henninggross]

WIP because I want to check if the tests are passing in GitHub actions.

Closes #585 Fixes #650

Tasks:

• [x] Updated design documents in docs/design directory or not applicable
• [x] Updated user-facing documentation in docs directory or not applicable
• [x] Ran tests (e.g. make test) or not applicable
• [x] Updated changelog or not applicable