regarding https://ziglang.org/news/migrate-to-self-hosting/
some people didn't understand why switching to self-hosting from the cloud makes website deployments faster.
I didn't explain in the article, so I'll explain here:
docker is slow, installing system dependencies is slow, uploading to the cloud is slow, etc.
with self-hosting you set up the computer ahead of time, then just run a script that copies files around on the same computer, which is really fast.
in our case we made the .zig-cache directory preserved across runs, so it additionally only has to rebuild the parts of the website that changed.