Add Dockerfile + fly.toml for single-host Fly deploy

[dougdevitre]

Summary

Adds Dockerfile, fly.toml, and .dockerignore so the voice center can be deployed single-host to Fly.io (HTTP + WebSocket both on one machine).

• Dockerfile — multi-stage Node 20 alpine build. Compiles TS in the build tier, ships only dist/ + production node_modules to a slim runtime image. tini forwards signals so Twilio WebSockets shut down cleanly on Fly redeploys.
• fly.toml — one always-on shared-cpu-1x / 512MB machine in ord. auto_stop_machines = false because voice calls can't tolerate cold starts. Health check hits /health every 30s.
• .dockerignore — keeps the build context small.

Deploy steps (from CloudShell, after merge)

cd ~/cotrackpro-talk
git pull
fly auth login                          # or set FLY_API_TOKEN env var
fly apps create cotrackpro-talk
FLY_APP_NAME=cotrackpro-talk ./scripts/sync-ssm-to-vercel.sh --target fly
fly secrets set SERVER_DOMAIN=cotrackpro-talk.fly.dev -a cotrackpro-talk
fly deploy

Test plan

• CI green
• After merge: fly deploy produces a live machine
• curl https://cotrackpro-talk.fly.dev/health returns 200
• Twilio webhook update → dial test for +1 314-394-8500

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Generated by Claude Code

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Project	Deployment	Actions	Updated (UTC)
cotrackpro-talk	Ready	Preview, Comment	May 16, 2026 6:13am