Add daily PR update workflow with discussion creation

[Copilot]

This PR adds a new agentic workflow that provides comprehensive daily updates on all pull requests in the repository and automatically creates a GitHub Discussion with the results.

Overview

The daily-pr-update.md workflow runs daily at 8:00 AM UTC to analyze all pull request activity and generate an organized report in the "daily-news" discussion category.

Features

Automated PR Analysis

The workflow automatically collects and analyzes:

• Open PRs - Categorized by status (approved, under review, awaiting review, draft)
• Recently Merged PRs - PRs merged in the last 24 hours with timing metrics
• Recently Closed PRs - PRs closed without merge in the last 24 hours
• PRs Needing Attention - Stale PRs (7+ days), long-running PRs (14+ days), and PRs with merge conflicts

GitHub API Integration

Uses the following GitHub tools for comprehensive data collection:

• list_pull_requests - Get all open pull requests
• search_pull_requests - Search for PRs by date and status
• pull_request_read - Retrieve detailed PR information
• get_repository - Get repository metadata
• list_commits - Analyze commit history

Discussion Creation

Automatically creates a well-formatted GitHub Discussion with:

• Summary statistics and quick metrics
• Categorized PR listings with relevant details
• Recent activity highlights (last 24 hours)
• Actionable recommendations for maintainers
• Top contributor analysis

Execution Details

• Schedule: Runs daily at 8:00 AM UTC via cron
• Manual Trigger: Can be run on-demand via workflow_dispatch
• AI Engine: Uses GitHub Copilot CLI for intelligent analysis
• Timeout: 10 minutes
• Permissions: Read-only for main job, discussions write handled by safe-outputs
• Cache Memory: Enabled for persistent storage across runs

Example Output

The workflow generates discussions with this structure:

# 📊 Daily Pull Request Update - 2024-10-21

## Summary
- 📂 Open PRs: 12
- ✅ Merged Today: 3
- ❌ Closed Today: 1
- ⏳ Awaiting Review: 5
- 🔄 Under Review: 4
- ⚠️ Needs Attention: 2

## Open Pull Requests
[Categorized by status with PR numbers, titles, and authors]

## Recent Activity (Last 24 Hours)
[Merged and closed PRs with timing information]

## PRs Needing Attention ⚠️
[Stale, long-running, or conflicted PRs]

## Top Contributors (This Week)
[Activity metrics by author]

Testing

• ✅ Workflow compiles successfully via gh aw compile
• ✅ All unit tests pass
• ✅ make agent-finish validation passes
• ✅ Appears correctly in gh aw status output

This workflow helps maintainers and contributors stay informed about PR activity and ensures important pull requests don't get overlooked.

Original prompt

Create a agentic workflow that provides daily updates on all pull requests in PRS and initiates a discussion with the results.

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