feat: allow overriding rolldown version

[sapphi-red]

Added a way to override rolldown version. This would be helpful to test the latest Rolldown version before releasing Rolldown.

It requires the pkg.pr.new package to be published for that commit.

[dominikg]

how long does rolldown build take, maybe we can use the builds directory for it instead?

[sapphi-red]

It seems it takes around 4 minutes

[dominikg]

4min is a bit steep, do you automatically deploy rolldown to pr.new? I remember a previous discussion about consuming vite builds from there and it gets a little tricky with knowing when/if a hash is available there.

#354

As long as this is only for our internal manual use and not affecting scheduled runs it may be fine, similar to the other vite plugin inputs we already have, but i'd like to avoid those getting out of hand.

[sapphi-red]

4min is a bit steep, do you automatically deploy rolldown to pr.new?

I was only thinking about manually triggering this workflow before releasing rolldown.