docs: improve PG_URL environment variable documentation

[d-bytebase]

Summary

• Improved the PG_URL environment variable documentation in the external PostgreSQL configuration guide
• Made the configuration options clearer and more comprehensive

Changes

• Renamed section from "PG_URL String Format" to "PG_URL Environment Variable" for clarity
• Added documentation for two configuration methods:
  • Direct connection string configuration
  • File path configuration for Kubernetes and secret management integration
• Included code examples for both approaches
• Documented automatic secret rotation support when using file-based configuration

Test Plan

• Documentation changes only - no functional changes
• Verified markdown formatting and links

🤖 Generated with Claude Code

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Project	Deployment	Preview	Comments	Updated (UTC)
bytebase-com	✅ Ready	Preview	Comment	Aug 13, 2025 8:25am

[Copilot]

Pull Request Overview

This PR improves the documentation for the PG_URL environment variable in the external PostgreSQL configuration guide. The changes focus on making the configuration options clearer and more comprehensive for users.

• Renamed the section from "PG_URL String Format" to "PG_URL Environment Variable" for better clarity
• Added documentation for both direct connection string and file path configuration methods
• Included specific guidance for Kubernetes deployments and secret management integration

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[github-actions]

📝 Broken Links Check Report

Note: Entries under /api-reference/ are likely false positives and can be ignored.

The following is the output from the broken links check:

found 16 broken links in 9 files

integrations/api/audit-log.mdx
 ⎿  /api-reference/auditlogservice/post-v1auditlogs:search

integrations/api/authentication.mdx
 ⎿  /api-reference/authservice/post-v1authlogin

integrations/api/data-classification.mdx
 ⎿  /api-reference/settingservice/patch-v1settings
 ⎿  /api-reference/databaseservice/patch-v1instances-databases

integrations/api/issue.mdx
 ⎿  /api-reference/issueservice/post-v1projects-issues

integrations/api/permission.mdx
 ⎿  /api-reference/workspaceservice/get-v1workspaces-:getIamPolicy
 ⎿  /api-reference/projectservice/get-v1projects-:getIamPolicy
 ⎿  /api-reference/roleservice/get-v1roles
 ⎿  /api-reference/userservice/get-v1users
 ⎿  /api-reference/groupservice/get-v1groups

integrations/api/plan.mdx
 ⎿  /api-reference/planservice/post-v1projects-plans
 ⎿  /api-reference/sheetservice/post-v1projects-sheets

integrations/api/release.mdx
 ⎿  /api-reference/releaseservice/post-v1projects-releases

integrations/api/rollout.mdx
 ⎿  /api-reference/rolloutservice/post-v1projects-rollouts

integrations/api/sql-review.mdx
 ⎿  /api-reference/releaseservice/post-v1projects-releases:check
 ⎿  /api-reference/sqlservice/post-v1sqlcheck

[h3n4l]

LGTM