I've long since given up having projects, but when I used to do that kind of stuff I would mostly run either on Heroku's free tier (RIP) or on my home server.

I've long since given up having projects, but when I used to do that kind of stuff I would mostly run either on Heroku's free tier (RIP) or on my home server. These days I'd probably opt for one of the various free static site hosting options like DO or Github. If I needed an actual server I'd probably still go for DO, or try and cram it into the GCP free tier.