Build multiple decks doesn't update `base`

[mAAdhaTTah]

Describe the bug

I have multiple decks that I run the build for accordingly: slidev build --base /talks/ --out public/talks talks/*.md. Those multiple decks are correctly output into public/talks/deck-1 and public/talks/deck-2 respectively. However, the assets path injected into the index.html files generated is only prefixed with /talks/, rather than /talks/deck-1 respectively, so the relevant assets aren't found when the deck is served from /talks/deck-1/assets where they live.

Minimal reproduction

Steps to reproduce the behavior:

1. Create multiple decks
2. Run the build command with a glob for multiple decks
3. See that they're correctly output into individual folders
4. See that the assets path don't reference those folders.

I can push an example to my personal site where I'm trying to configure this if it's helpful. Feasibly, I could also figure out a workaround (glob all of the files, iterate over them and call build with the proper base & out) if this isn't considered a bug but given the support for building multiple decks, I'm thinking it is.

Environment

• Slidev version: 52.8.0
• Browser: Chrome
• OS: Mac OS