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I'd say Digital Ocean's newish Apps platform. Static sites are free and they can run a build step for you (still free).

For the curious, here's DigitalOcean's page describing the App Platform, including a breakdown of prices.

"..Build and deploy 3 static sites for free."

Only 1G of transfer on the free tier though. That's fairly middling.

I didn't see that when they launched -- wondering now if I'm blind or they added that caveat after the fact