feat(otel): add github.ref and github.sha to span resource attributes

[Copilot]

github.ref and github.sha were absent from OTel span resource attributes, making it impossible to filter traces by branch or commit SHA in Grafana/Honeycomb/Datadog without manually following run URLs.

Changes

• send_otlp_span.cjs — reads GITHUB_REF and GITHUB_SHA in both sendJobSetupSpan() and sendJobConclusionSpan(), conditionally pushing github.ref and github.sha to resourceAttributes following the existing github.event_name pattern:

if (ref) {
  resourceAttributes.push(buildAttr("github.ref", ref));
}
if (sha) {
  resourceAttributes.push(buildAttr("github.sha", sha));
}

• send_otlp_span.test.cjs — adds GITHUB_REF/GITHUB_SHA to envKeys teardown lists for both span suites; adds present/absent assertion tests for each new attribute in both setup and conclusion spans.

[Copilot]

Pull request overview

Adds GitHub branch/ref and commit SHA metadata to the OTLP span resource attributes so traces can be filtered by branch/commit in observability backends.

Changes:

• Read GITHUB_REF / GITHUB_SHA in both setup and conclusion span emitters.
• Conditionally append github.ref / github.sha to resourceAttributes.
• Extend tests to cover presence/absence of the new resource attributes and ensure env teardown includes the new keys.

Show a summary per file

File	Description
actions/setup/js/send_otlp_span.cjs	Adds conditional github.ref and github.sha resource attributes to both setup and conclusion spans.
actions/setup/js/send_otlp_span.test.cjs	Adds env teardown keys and new assertions verifying github.ref/github.sha inclusion/omission.

Copilot's findings

Tip

Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

• Files reviewed: 2/2 changed files
• Comments generated: 2

[Copilot]

The JSDoc for sendJobSetupSpan lists “Environment variables consumed” but doesn’t include the newly read GITHUB_REF/GITHUB_SHA (and also omits some other env vars used in this function). Please update the doc block so it accurately reflects the env vars this span depends on.

[Copilot]

The sendJobConclusionSpan JSDoc “Environment variables consumed” list should be updated to include GITHUB_REF/GITHUB_SHA now that these values are read and exported as resource attributes.