[fatal-guard] Docker support: multi-stage Dockerfile + Alpine base image

[Ikalus1988]

Goal

Package fatal-guard as a Docker image for portable, reproducible crash capture.

Context

fatal-guard works as a Node.js package but requires Node.js installed. Docker makes it:

• Portable across environments (CI, server, edge)
• Reproducible (pinned Node version, Alpine base)
• Easy to integrate into existing Docker-based workflows

Scope

• Create packages/fatal-guard/Dockerfile:
  • Multi-stage build (build + runtime)
  • Alpine base for minimal image size
  • Non-root user for security
  • Health check endpoint
• Add docker-compose.yml for local testing
• Test: docker run fatal-guard -- node app.js captures crash
• CI: build + push on tag (.github/workflows/fatal-guard-publish.yml)
• Document in packages/fatal-guard/README.md

Deliverable

• docker build succeeds (<50MB image)
• docker run captures crash and outputs tombstone
• CI builds and pushes on v* tag
• README documents Docker usage

Labels

ready, agent-friendly, zero-bounty

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