Set CDN Replacement config value if default CDN unavailable

[et-nik]

Summary by CodeRabbit

• New Features
  • Added automatic CDN availability checks during daemon installation and updates.
  • Automatically configures reachable CDN mirrors for daemon repository downloads.
  • Preserves existing configuration entries and comments while avoiding unnecessary changes.
• Bug Fixes
  • Handles unavailable CDN sources gracefully with non-blocking warnings.
  • Prevents configuration changes when no CDN is reachable or when configuration data is invalid.

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: ff13fba3-7bec-43ab-9cad-b58fa0b6c3a6

📥 Commits

Reviewing files that changed from the base of the PR and between 9088d71 and 9773d49.

📒 Files selected for processing (7)

• internal/actions/daemon/install/daemon_install.go
• internal/actions/daemon/update/daemon_update.go
• internal/pkg/daemon/repository_replacements.go
• internal/pkg/daemon/repository_replacements_test.go
• pkg/releasesource/cdn.go
• pkg/releasesource/cdn_internal_test.go
• pkg/releasesource/source.go

🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

• gameap/gameap.github.io (manual)

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📝 Walkthrough

Walkthrough

The change adds GameAP CDN availability probing, applies reachable CDN mirror replacements to daemon YAML configuration, and invokes this setup during daemon installation and updates.

Changes

CDN fallback integration

Layer / File(s)	Summary
CDN availability probing pkg/releasesource/cdn.go, pkg/releasesource/source.go, pkg/releasesource/cdn_internal_test.go	The code exposes GameAP CDN host constants and concurrently probes configured CDN sources. Tests cover reachable, unavailable, filtered, and environment-override cases.
Daemon replacement configuration internal/pkg/daemon/repository_replacements.go, internal/pkg/daemon/repository_replacements_test.go	The daemon package plans reciprocal replacements, preserves existing YAML content and comments, supports supported replacement structures, and reports malformed or unsupported input. Tests cover insertion, preservation, idempotency, and errors.
Install and update wiring internal/actions/daemon/install/daemon_install.go, internal/actions/daemon/update/daemon_update.go	Daemon installation and updates resolve the configuration path and apply CDN replacements. Setup failures are logged as non-fatal warnings.

Estimated code review effort: 4 (Complex) | ~45 minutes

Sequence Diagram(s)

sequenceDiagram
  participant DaemonAction
  participant CDNAvailability
  participant DaemonConfig
  DaemonAction->>CDNAvailability: Probe GameAP CDN sources
  CDNAvailability-->>DaemonAction: Return availability by host
  DaemonAction->>DaemonConfig: Add reachable mirror replacements
  DaemonConfig-->>DaemonAction: Save configuration when changed

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Possibly related PRs

• gameap/gameapctl#22: Related daemon install/update and GameAP CDN fallback changes.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: configuring CDN replacements when the default CDN is unavailable.
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.

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

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