feat(wrangler): support long branch names in preview alias generation

[WillTaylorDev]

Updates generatePreviewAlias to truncate long branch names with hash suffixes when they exceed DNS label constraints, instead of returning undefined. This allows preview deployments for branches with longer descriptive names.

Fixes #WC-3840

• Tests
  • Tests included
  • Tests not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: alias generation is a function of WCI, and is best-effort.
• Wrangler V3 Backport
  • Wrangler PR:
  • Not necessary because: v4 feature only

[changeset-bot]

🦋 Changeset detected

Latest commit: b8cf380

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
wrangler	Minor
@cloudflare/vite-plugin	Major
@cloudflare/vitest-pool-workers	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[pkg-pr-new]

create-cloudflare

npm i https://pkg.pr.new/create-cloudflare@10283

@cloudflare/kv-asset-handler

npm i https://pkg.pr.new/@cloudflare/kv-asset-handler@10283

miniflare

npm i https://pkg.pr.new/miniflare@10283

@cloudflare/pages-shared

npm i https://pkg.pr.new/@cloudflare/pages-shared@10283

@cloudflare/unenv-preset

npm i https://pkg.pr.new/@cloudflare/unenv-preset@10283

@cloudflare/vite-plugin

npm i https://pkg.pr.new/@cloudflare/vite-plugin@10283

@cloudflare/vitest-pool-workers

npm i https://pkg.pr.new/@cloudflare/vitest-pool-workers@10283

@cloudflare/workers-editor-shared

npm i https://pkg.pr.new/@cloudflare/workers-editor-shared@10283

wrangler

npm i https://pkg.pr.new/wrangler@10283

commit: b8cf380

[petebacondarwin]

OOC what happens if the preview alias is already used?

[WillTaylorDev]

OOC what happens if the preview alias is already used?

If a preview alias is already used, EWC will point the alias to the present version being uploaded. The hash being suffixed on the end of the alias ensures that branches with the same long prefix will still get distinct aliases.