ci: gate Ubuntu backup runners on UBUNTU_BACKUP_ENABLED variable

[QuantumExplorer]

Summary

• All Ubuntu backup jobs (test shards, formatting/linting, doctests) now only run when repository variable UBUNTU_BACKUP_ENABLED is true
• Toggle at Settings > Variables > Actions — no code changes needed
• When Mac runners are healthy: leave unset or false (saves ~6 Ubuntu runners per PR)
• When Mac runners are down: set to true to enable fallback

Setup

1. Go to https://github.com/dashpay/platform/settings/variables/actions
2. Add variable UBUNTU_BACKUP_ENABLED with value true or false
3. If not set, defaults to disabled (Ubuntu backups don't run)

Test plan

• Verify Ubuntu backup jobs are skipped when variable is unset/false
• Verify Ubuntu backup jobs run when variable is true

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated continuous integration workflows to conditionally execute test and lint jobs based on environment configuration settings.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d2adaece-84da-4d53-ba4b-630473a2486e

📥 Commits

Reviewing files that changed from the base of the PR and between 755cbe2 and d297d9d.

📒 Files selected for processing (2)

• .github/workflows/tests-rs-doctests.yml
• .github/workflows/tests-rs-workspace.yml

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📝 Walkthrough

Walkthrough

GitHub Actions workflow configuration files are updated to add conditional execution guards. The changes introduce if: env.UBUNTU_BACKUP_ENABLED == 'true' conditions to specific CI/CD jobs, controlling when they execute based on an environment variable setting.

Changes

Cohort / File(s)	Summary
GitHub Actions Conditional Guards .github/workflows/tests-rs-doctests.yml, .github/workflows/tests-rs-workspace.yml	Added environment variable conditionals (UBUNTU_BACKUP_ENABLED == 'true') to job execution. Doctests backup job gains one condition; test-ubuntu and lint-ubuntu jobs each gain a condition. Jobs skip execution when the environment variable is false.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 When workflows need a guard so wise,
Environment checks open our eyes,
Ubuntu backups dance to the tune,
Of conditional flags—skip or soon!
A hop, a skip, let jobs align,
With toggles that make workflows shine! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically describes the main change: adding conditional logic to gate Ubuntu backup runners on the UBUNTU_BACKUP_ENABLED variable.
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 ci/ubuntu-backup-toggle

📝 Coding Plan

• Generate coding plan for human review comments

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