Parse Compose service network object form for aliases

[thromel]

Summary

container-compose fails to decode the Compose object form for service networks, which is required for aliases and per-network service options.

Environment

- OS: macOS 26.5.1 (25F80)
- Xcode: 26.5 (17F42)
- container: 1.0.0 (release, commit ee848e3)
- container-compose: 1.0.0 installed via Homebrew
- Architecture: arm64

Reproduction

compose.yml:

services:
  web:
    image: nginx:alpine
    networks:
      appnet:
        aliases:
          - web-alias

  probe:
    image: busybox:latest
    depends_on:
      - web
    networks:
      - appnet
    command: ["sh", "-c", "wget -qO- http://web-alias"]

networks:
  appnet:

Run:

container-compose --file compose.yml up -d

Actual behavior

Error: DecodingError.typeMismatch: expected value of type Sequence. Path: services.web.networks. Debug description: Expected to decode Sequence but found Node instead.

Expected behavior

Compose supports both forms:

networks:
  - appnet

and:

networks:
  appnet:
    aliases:
      - web-alias

container-compose should parse the object form and either:

• apply supported per-network service settings, or
• produce a targeted unsupported-field warning while continuing for settings it can support.

Aliases may depend on the broader service-discovery/DNS work, but the YAML decoder should accept the Compose object shape.