fix: ensure alias is set to branch

[sastan]

This PR ensures to always set the alias url output to point to the branch url by replacing the hash in the deployment url with the branch name.

[WalshyDev]

This won't always work. Ideally, we just remove the race condition instead or have it exposed regardless. I'll leave this open for now

[jasikpark]

++ to fixing this - we use direct uploads & pass a branch name, resulting in url === alias on most runs

I'll just hardcode the url myself for now... https://${{ steps.branch-name.outputs.current_branch }}.${{ env.CF_PROJECT_SLUG }}.pages.dev/

[jasikpark]

ah, hardcoding has some caveats since. it needs to be url encoded somehow + cf truncates branch names in the subdomain

[Hanawa02]

Would it be possible to pass the alias instead?