Change preview domains to mtcl.cc

[hlbmtc]

Summary by CodeRabbit

• Chores
  • Updated PR preview environments to use a custom preview domain with HTTPS provisioning for secure previews.
  • Ensured the preview URL is exposed to the app via an environment variable for clearer preview links.
  • Minor cleanup/formatting improvements in the preview workflow.

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[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

Updates the GitHub Actions PR preview workflow to use a custom Cloudflare Worker preview domain (APP_NAME-preview.mtcl.cc) instead of the Fly.io default, adjusts APP_DOMAIN/PUBLIC_APP_URL, adds a Fly CLI cert registration step, and adds a minor blank-line formatting change in the cleanup block.

Changes

Cohort / File(s)	Summary
PR preview workflow .github/workflows/pr_preview.yml	Switch preview domain from APP_NAME.fly.dev to APP_NAME-preview.mtcl.cc; set APP_DOMAIN and PUBLIC_APP_URL to the new domain; add flyctl certs add step for domain cert registration; add one blank line in PR cleanup formatting.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• Implement Preview Deployments #4101: Modifies the same .github/workflows/pr_preview.yml and APP_DOMAIN/PUBLIC_APP_URL handling for preview deployments.

Suggested reviewers

• ncarazon
• elisescu

Poem

🐰 I hopped from Fly to Cloudflare's shore,
Preview blossoms on mtcl.cc's floor,
Certs and envs all set just so,
Small changes make the pipeline glow —
A carrot-sized cheer for the CI flow!

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Change preview domains to mtcl.cc' directly and clearly describes the main change in the pull request: updating the preview deployment domain to use a custom Cloudflare Worker domain (mtcl.cc).

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📜 Recent review details

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between edb38af and e4eb987.

📒 Files selected for processing (1)

• .github/workflows/pr_preview.yml

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