Add shared github-context.md import for comprehensive GitHub invocation context

[Copilot]

Adds a reusable shared workflow component that provides comprehensive GitHub context information (event type, issue/PR IDs, comment IDs, repository details, commit SHAs, etc.) via a simple import.

Changes

• .github/workflows/shared/github-context.md - Shared context component with 40+ GitHub context fields:

  • Repository and workflow execution details (run ID, actor, job ID)
  • Event-specific context for all GitHub event types (issues, PRs, comments, reviews, releases, deployments, checks, projects)
  • Commit context (before/after SHAs, head commit)
  • Sanitized content access instructions

• Example workflows demonstrating usage:

  • test-github-context.md - Basic import example
  • example-context-aware-analyzer.md - Real-world issue analyzer

• Documentation - Updated docs/src/content/docs/reference/imports.md with "Built-in Shared Imports" section

Usage

---
on: issues
engine: copilot
imports:
  - shared/github-context.md
---

# Your Workflow

The GitHub context will be available above with relevant fields populated based on the triggering event type.

Fields automatically populate based on event type - non-applicable fields evaluate to empty strings. No conditional logic needed.

Original prompt

Create a context share agentic workflow that uses conditonal templating to provide the current complete github invocation context: event type, issue id, pull request id, repo, comment id, parent...

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