Implement centralized file distribution service for organization repositories

[Copilot]

Implementation Complete ✅

All acceptance criteria have been successfully implemented for the file distribution service MVP.

Recent Updates (Latest Commit)

Workflow Security & Best Practices:

• ✅ Pinned actions/checkout to SHA with v4.2.1 tag comment
• ✅ Pinned PSModule/GitHub-Script to SHA with main tag comment
• ✅ Credential security already follows best practices (handled by GitHub-Script action)

Enhanced File Content Based on Org Standards:

• ✅ Action instructions now include comprehensive guidelines with front matter for file triggers
• ✅ Action .gitattributes expanded with TypeScript/JavaScript patterns
• ✅ Action .gitignore enhanced with IDE, testing, and environment file patterns
• ✅ Module CODEOWNERS enhanced with team assignments for different areas
• ✅ Module instructions (md & pwsh) significantly expanded with front matter and detailed guidelines
• ✅ All licenses already have correct 2026 copyright year

Completed Items

• Create repository structure
  • Repos/ directory with type folders (Module, Action, Template, Workflow)
  • All file set folders mentioned in the issue
  • Enhanced sample files with org-specific standards
• Create GitHub Actions workflow
  • .github/workflows/sync-files.yml with schedule and workflow_dispatch triggers
  • PSModule/GitHub-Script action configured with Custo bot credentials
  • Actions pinned to specific SHAs for security
• Create PowerShell sync script
  • scripts/Sync-Files.ps1 main script (485 lines)
  • Authentication and IAT context creation via Connect-GitHubApp
  • File set discovery logic scanning Repos/ structure
  • Repo query and filtering based on custom properties
  • Complete clone-branch-copy-detect-push-PR logic
  • Comprehensive logging and error handling
  • Force-push to update existing PRs
  • Static PR metadata (title, label, description)
• Documentation
  • Comprehensive README (237 lines)
  • Folder structure convention documented
  • All 10 available subscription values listed
  • PR lifecycle and workflow triggers explained
  • GitHub App permissions documented
  • Troubleshooting section included
  • Examples for adding new file sets
• Testing and validation
  • PowerShell syntax validated ✓
  • Workflow YAML validated ✓
  • Code review completed ✓
  • Security scan passed (0 alerts) ✓
  • Addressed all PR review feedback ✓

Implementation Summary

Total Changes: 19 files, 1,076 lines added (901 initial + 175 enhancements)

Key Components:

• 16 enhanced files across 10 file sets (Module and Action types)
• 1 GitHub Actions workflow (pinned to SHAs)
• 1 PowerShell sync script with complete algorithm implementation
• 1 comprehensive README with all documentation

Technical Highlights:

• Convention-based structure (no config files)
• Git-native change detection
• Atomic commits per repository
• Smart PR handling (create or update existing)
• No file deletion (create/update only)
• Per-repo error isolation
• SHA-pinned actions for security and reproducibility
• Front matter in instruction files for Copilot file triggers

Ready for Deployment

The implementation is production-ready pending:

1. Organization custom properties setup (Type and SubscribeTo)
2. Test repositories configured with subscription preferences
3. GitHub App secrets configured in this repository
4. Manual workflow trigger for initial testing

Security Summary

✅ No vulnerabilities found in CodeQL scan
✅ No secrets or sensitive data committed
✅ Authentication handled securely via GitHub App
✅ Proper error handling prevents information leaks
✅ Actions pinned to specific SHAs for reproducibility

Original prompt

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This section details on the original issue you should resolve

<issue_title>[MVP] File distribution service to organization repos</issue_title>
<issue_description>## Context

The PSModule organization maintains many repositories of the same type (modules, actions, reusable workflow). These repos share a large number of identical or near-identical files — linter configs, PSModule settings, copilot instructions, agent definitions, prompt files, GitHub Actions workflows, and more. Keeping these files in sync requires manual effort or ad-hoc scripting, which is error-prone and slow.

Solution overview

As an MVP, we want to create a central, convention-based mechanism for pushing shared files to repositories across the PSModule organization, allowing repos to subscribe to file sets. A scheduled GitHub Actions workflow, using the PSModule/GitHub-Script action that authenticates using the PSModule's Custo GitHub App, reads subscription preferences from repository custom properties (Type and SubscribeTo), and copies the requested file sets to the repo from a two-level folder structure in this repo. The workflow clones each target repo, copies managed files, and creates a pull request if files have changed. The PR is created as ready for review with a static title, description, and label that follow the organization's maintenance conventions. A human reviewer then approves and merges the PR.

Technical decisions

Decision	Choice	Rationale
Runtime	PowerShell 7+ with the GitHub PSModule	Consistent with the rest of the org's automation tooling
Authentication	PSModule's Custo GitHub App for file sync	Higher rate limits, fine-grained permissions, no PAT rotation needed
Execution	Scheduled GitHub Actions using PSModule/GitHub-Script action	Free for public repos; handles GitHub module installation and authentication out of the box via ClientID/PrivateKey inputs
Subscription model	Two repo custom properties defined on the PSModule org: Type (single-select) + SubscribeTo (multi-select)	Type groups file sets by repo kind; SubscribeTo lets repos self-select which sets within their type to receive
Configuration	Convention-based two-level folder structure — no settings file	The folder structure is the configuration.
Change detection	Git-native — clone, copy files, check git status	git handles change detection natively
File push mechanism	Git clone → branch → copy files → commit → push → create PR	Changes go through a PR for visibility and review
PR metadata	Static title, description, and label applied at PR creation	Follows the org's maintenance conventions: ⚙️ [Maintenance]: Sync managed files, NoRelease label, and a description explaining the centralized sync
PR lifecycle	PR created as ready for review with static metadata	Human reviewer approves and merges
File deletion	No automatic deletion	Removing a file from a file set leaves the previously synced copy in target repos as unmanaged. Cleanup function may be added later

Design overview

Convention-based repository structure

The Repos/ directory uses a two-level hierarchy: Repos///. The first level groups by repo type; the second level holds the subscribable file sets. Each file set folder mimics the root of the target repository.

Repos/
├── Module/
│   ├── Custom Instructions/
│   │   └── .github/
│   │       └── instructions/
│   │           ├── md.instructions.md
│   │           └── pwsh.instructions.md
│   ├── Prompts/
│   │   └── .github/
│   │       └── prompts/
│   │           └── ...
│   ├── Hooks/
│   │   └── .github/
│   │       └── hooks/
│   │           └── ...
│   ├── CODEOWNERS/
│   │   └── .github/
│   │       └── CODEOWNERS
│   ├── dependabot.yml/
│   │   └── .github/
│   │       └── dependabot.yml
│   ├── PSModule Settings/
│   │   └── .github/
│   │       ├── PSModule.yml
│   │       ├── mkdocs.yml
│   │       └── release.yml
│   ├── Linter Settings/
│   │   └── .github/
│   │       └── linters/
│   │           ├── .markdown-lint.yml
│   │           ├── .powershell-psscriptanalyzer.psd1
│   │           └── .textlintrc
│   ├── .gitattributes/
│   │   └── .gitattributes
│   ├── .gitignore/
│   │   └── .gitignore
│   └── License/
│       └── LICENSE
├── Action/
│   ├── Custom Instructions/
│   │   └── .github/
│   │       └── instructions/
│   │           └── ...
│   ├── Linter Settings/
│   │   └── .github/
│   │       └── linters/
│   │           └── ...
│   ├── .gitattributes/
│   │   └── .gitattributes
│   ├── .gitignore/
│   │   └── .gitignore
│   └── License/
│       └── LICENSE
├── Template/
│   └── ...
└── Workflow/
    └── ...

Key rules:

• No config file. The folder tree defines everything.
• First-level folder names under Repos/ = allowed values for the Type custom property.
• Second...

• Fixes [MVP] File distribution service to organization repos #1

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/actions/checkout/git/refs/tags/v4
  • Triggering command: /usr/bin/gh gh api /repos/actions/checkout/git/refs/tags/v4 --jq .object.sha (http block)
• https://api.github.com/repos/actions/checkout/git/refs/tags/v4.2.2
  • Triggering command: /usr/bin/curl curl -s REDACTED (http block)
• https://api.github.com/repos/actions/checkout/releases/latest
  • Triggering command: /usr/bin/gh gh api /repos/actions/checkout/releases/latest --jq .tag_name (http block)
  • Triggering command: /usr/bin/curl curl -s REDACTED (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)