Run snippets as part of CI

[TimoGlastra]

As we already have the snippets it will be trivial to run them as part of the CI. Node 18 inroduced a built in test runner, maybe that's something to look at to keep things light? (https://nodejs.org/api/test.html). Downside is that it will be harder to test snippets in older node versions. We can also use jest (or just a plain node file that runs all scripts and makes ci fail if anything throws an error)