chore(ci): deploy workflow support custom backend url

[hexqi]

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PR

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our Commit Message Guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• Built its own designer, fully self-validated

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

Background and solution

What is the current behavior?

• deploy-gh-pages workflow 的后端环境通过 alpha/production 下拉选择，无法指向自定义后端地址。之前默认的 agent-alpha/agent.opentiny.design 地址已失效。
• 同时 ${{ github.event.inputs }} 直接内联在 run 脚本中，存在模板注入风险。

Issue Number: N/A

What is the new behavior?

• 将 environment（choice: alpha/production）替换为 backend_url（string 类型），默认值为 https://agent.bytedev.site/，支持输入任意自定义后端地址
• 将 GitHub 表达式移至 step env 映射中赋值，run 内只引用普通 shell 变量，消除模板注入风险

Does this PR introduce a breaking change?

• Yes
• No

Other information

Summary by CodeRabbit

• Chores
  • Updated deployment workflow to accept a configurable backend URL parameter instead of predefined environment selection.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: bd37b4cf-b6dd-4531-9039-3ccf067210d5

📥 Commits

Reviewing files that changed from the base of the PR and between 294bafd and 25a2ec4.

📒 Files selected for processing (1)

• .github/workflows/deploy-gh-pages.yml

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Walkthrough

The GitHub Pages deploy workflow now accepts a required backend_url string via workflow_dispatch; the CI step uses that URL to set VITE_ORIGIN_URL and appends VITE_ORIGIN into designer-demo/env/.env.alpha, replacing the previous environment-choice logic.

Changes

Backend URL Input Configuration

Layer / File(s)	Summary
Backend URL input and environment variable generation .github/workflows/deploy-gh-pages.yml	workflow_dispatch input changed from an environment choice (alpha/production) to a required backend_url string input. CI step now reads ENV_BACKEND_URL to compute VITE_ORIGIN_URL and appends VITE_ORIGIN into designer-demo/env/.env.alpha, removing hardcoded alpha/production selection and DEPLOY_ENV export.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 No more alpha or prod choice,
Now the backend URL makes all rejoice!
One input string flows through the night,
Deployment config, flexible and light! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'chore(ci): deploy workflow support custom backend url' accurately describes the main change: replacing the environment choice input with a backend_url string input.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In @.github/workflows/deploy-gh-pages.yml:
- Around line 39-46: The workflow currently expands `${{
github.event.inputs.backend_url }}` directly inside the run script, allowing
template injection; change it to pass the input via the job step env mapping
(e.g. set ENV_BACKEND_URL: ${{ github.event.inputs.backend_url ||
'https://agent.bytedev.site/' }}) and then reference that shell variable inside
the run block (use "$ENV_BACKEND_URL" to set VITE_ORIGIN_URL and write to
designer-demo/env/.env.alpha), ensuring no inline GitHub expression is placed
inside the heredoc or the shell assignment.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 25066301-9fc0-4184-961e-e4d4d15473f1

📥 Commits

Reviewing files that changed from the base of the PR and between 87ac1e0 and a201555.

📒 Files selected for processing (1)

• .github/workflows/deploy-gh-pages.yml