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.astro is a dir rather than a file. Astro projects also include .gitignore and .dockerignore which we shouldn't be dropping.

Maybe we could do this a different way. The default Astro project .gitignore file excludes .git, .venv, and other files we shouldn't include, so perhaps we could use the go-git package to figure out which paths are allowed by .gitignore and only include those? (I've done something similar for an internal component of Astro IDE)