Basically any you pick from https://dev.to/jainilprajapati/7-fantastic-heroku-alternatives-4jf8 will work fine. Personally using Northflank, used Render before but it was slightly limited for our needs (I saw they released few new features though). Koyeb I believe offers a free tier, maybe Railway too (haven't checked the others for some time).
Make sure to check whether they support deploying to your region first, Koyeb and Railway were US-first, not sure they have full EU datacenter support yet.
AFAIK they all use buildpacks. Basically you connect your github repository, they pull the code, buildpack detects you're using node with npm/yarn, run npm build for you and capture the state after that to a docker(ish) image.
Then they push the image to their infra, run npm start in them and wire port 3000 to their loadbalancers, attach a domain, issue tls certificate, and all the other steps you need to do when you deploy your app.