🔧 Add Automated Tutorial Agent Build Pipeline

Summary

Introduces a CI/CD pipeline that automatically builds and deploys tutorial agent Docker images with intelligent change detection and maintainer-only manual overrides. These images are used by the scale-agentex repo as part of integration testing.

Key Features

🎯 Smart Change Detection

• Git diff automatically detects which tutorial agents have changes
• Only builds changed agents (vs all 17+ agents every time)
• Matrix parallelization for faster builds

🔐 Access Control

• Manual rebuild_all flag restricted to admin/maintainer permissions
• Permission validation via GitHub API for workflow dispatch

🚀 Multi-Trigger Support

• Pull Requests: Validate builds (no registry push)
• Main Branch: Build + push to GHCR (latest tag)
• Manual Override: rebuild_all=true rebuilds all agents

Workflow Behavior

Usage

Manual rebuild all agents (maintainers only)
gh workflow run build-and-push-tutorial-agent.yml --field rebuild_all=true

Benefits

• Faster CI: Only builds what changed
• Secure: Prevents unauthorized expensive builds
• Reliable: PR validation catches issues before merge
• Visible: Clear job names per agent

Images published to ghcr.io/{owner}/{repo}/tutorial-agents/{agent-name}:latest