ci: track inference + .github/e2e-track

[MuncleUscles]

Updates the auto-gate to read the target track from .github/e2e-track on the PR's base branch, so PRs into different long-lived branches automatically use the right matrix.

This branch's main path:

• updates e2e.yml to the latest template
• adds .github/e2e-track = main so PRs into main auto-gate against v0.5 stable.

Companion: v2-dev gets its own e2e-track = v0.6-dev (separate update).

Required before merge: ci-core-e2e-runner#170 (the matrix system itself). Until that merges, the reusable-workflow uses: stays pinned at the feature branch.

Summary by CodeRabbit

• Chores
  • Enhanced e2e testing workflow to support branch-specific configuration through a dedicated configuration file.
  • Improved track resolution logic with strict validation and intelligent fallback handling.
  • Expanded workflow summary output for better visibility into resolved track sources.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a0460062-9010-41a1-9ee2-0726fe5b35d1

📥 Commits

Reviewing files that changed from the base of the PR and between 136558d and a2ec12f.

📒 Files selected for processing (2)

• .github/e2e-track
• .github/workflows/e2e.yml

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📝 Walkthrough

Walkthrough

The changes implement a dynamic track resolution system for E2E workflows, introducing a new .github/e2e-track configuration file and enhancing workflow parsing logic to resolve track values through priority-based fallback—explicit comment override, branch configuration file, or main default—with validation against an allowlist.

Changes

Cohort / File(s)	Summary
E2E Track Configuration .github/e2e-track	New file specifying main as the tracked value for E2E workflow branch configuration.
E2E Workflow Parsing .github/workflows/e2e.yml	Enhanced parse job to dynamically resolve track via priority order: explicit comment override, .github/e2e-track file fetch from base branch (via gh api), or main fallback. Added TRACK_PATTERN allowlist validation that fails the job on invalid track values. Consolidated output emission and expanded printed summary to include base_ref and track source metadata.

Sequence Diagram

sequenceDiagram
    participant GitHub as GitHub Workflow Event
    participant Parse as Parse Job
    participant Comment as Comment Check
    participant API as GitHub API<br/>(gh api)
    participant File as Base Branch<br/>.github/e2e-track
    participant Validate as Track Validation
    participant Output as Workflow Output

    GitHub->>Parse: Trigger with event data
    Parse->>Comment: Check if override<br/>in comment
    
    alt Comment Override Present
        Comment->>Validate: Use explicit track
    else No Comment Override
        Comment->>API: Fetch .github/e2e-track<br/>from base branch
        API->>File: Retrieve file
        File-->>API: Return track value
        alt File Exists & Readable
            API-->>Validate: Decoded track value
        else File Missing/Error
            Comment->>Validate: Use 'main' fallback<br/>+ warning
        end
    end
    
    Validate->>Validate: Test against<br/>TRACK_PATTERN allowlist
    
    alt Track Valid
        Validate->>Output: Emit resolved track
        Output->>GitHub: Job succeeds
    else Track Invalid
        Validate->>GitHub: Fail job
    end

Loading

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Poem

🐰 A track now dances through the branches fair,
With comments that whisper overrides in the air,
The .github/e2e-track file guards the way,
While validation ensures only the worthy stay,
Main waits patiently as our fallback friend! 🌿

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/track-inference

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