Fix dot files not being copied over on non-root builds (#9740)

[taktran]

Changes

Fixes #9740

When running astro build outside of where the astro files are, dotfiles are not copied over because the includeDotfiles parameter is not passed in. This PR adds a true includeDotfiles value to copyFiles to fix this.

Testing

1. Check out this PR locally

2. Download astro bug example https://stackblitz.com/edit/github-es2mdg-tnkbfm?file=README.md

3. Check bug

   cd another-astro
   pnpm install
   npm run astro build -- --root ../
   ls -la ../dist
   # Notice that there is no `.htaccess` file
   
   pnpm link [PR-root]/astro/packages/astro
   npm run astro build -- --root ../
   ls -la ../dist
   # Now there is a `.htaccess` file

Not sure if this requires an e2e test, but if so, please point me in the direction of an example of how one is set up.

Docs

Fixes a bug with build, so shouldn't affect any of the docs

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[lilnasy]

Tried this earlier. Looks great to me!

Thanks for fixing it 💜

[natemoo-re]

LGTM! I think with this change we might always be copying dotfiles and can probably remove the third argument? No need to take care of that in this PR, though.