Fix port collision bug, add --container-port flag

Port allocation:
- Use atomic flock-based allocation via /etc/ship/next_port
- Prevents race conditions when multiple deploys run concurrently
- Each app still gets its port stored in /etc/ship/ports/<name>

Docker container port:
- Add --container-port flag (default 80)
- Template now uses {{.ContainerPort}} instead of hardcoded 80
- Supports containers that listen on 8080, 3000, etc.

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