Add a GitHub Action to run npm test

[cclauss]

https://docs.github.com/en/actions/use-cases-and-examples/building-and-testing/building-and-testing-nodejs

• lts/* is currently Node.js v22
• latest is currently Node.js v23

Test results: https://github.com/cclauss/dvws-node/actions

Probably needs https://docs.docker.com/build/ci/github-actions