chore: add self-hosted Convex actions URL to environment configuration

[evan-taylor]

Summary

Adds docs to utilize convex actions in the app

How to Test

Steps to verify locally:

• npm run lint
• npm run typecheck
• npm test
• Manual flow:
  1. npm run dev:backend (in terminal A)
  2. npm run dev (in terminal B)
  3. Verify the change: <describe expected behavior/screens>

Checklist

• Tests added/updated (if applicable)
• Lint/tests pass locally (npm run lint)
• Docs updated (README/ADR/changelog if needed)
• Follows conventional commit format
• No merge conflicts with dev

Screenshots / Demos

(if UI or visible behavior - attach images, videos, or GIFs)

Summary by CodeRabbit

Release Notes

• Chores

  • Updated backend configuration to include a new actions URL environment variable for self-hosted deployments.

• Documentation

  • Updated setup guides and examples to reflect the new configuration option for self-hosted Convex actions URL.

[coderabbitai]

📝 Walkthrough

Walkthrough

Three configuration and documentation files updated to introduce a new environment variable CONVEX_SELF_HOSTED_ACTIONS_URL for specifying the self-hosted Convex actions endpoint URL across the backend setup examples.

Changes

Cohort / File(s)	Summary
Configuration & Documentation Updates backend/.env.example, docs/SELF_HOSTED_CONVEX.md, docs/contributing.md	Added new environment variable CONVEX_SELF_HOSTED_ACTIONS_URL to specify the self-hosted Convex actions endpoint. Variable placed after CONVEX_SELF_HOSTED_URL with example value https://actions.polybuys.com in contributing docs.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A new variable hops into place,
CONVEX_SELF_HOSTED_ACTIONS_URL joins the race,
With actions and webhooks now configured just right,
Our self-hosted setup shines oh so bright! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description is incomplete. While it includes the template sections, critical information is missing: no linked issues, vague summary, and manual testing steps lack specific expected behavior details.	Add linked issue numbers, clarify what 'utilize convex actions in the app' means, and specify expected behavior/screens to verify in manual testing steps.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding a self-hosted Convex actions URL to environment configuration files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch evan/convex-actions-docs

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No actionable comments were generated in the recent review. 🎉

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