fix(parsing): support map form of depends_on with condition syntax

[24601]

Problem

container-compose throws a typeMismatch error on any compose file that uses the map form of depends_on:

depends_on:
  db:
    condition: service_healthy

This is valid Docker Compose spec (v2+) and is common in real-world stacks (Windmill, Keycloak, Traefik setups, etc). Only the list form worked:

depends_on:
  - db

Fix

In Service.swift, after failing to decode as String or [String], attempt to decode as [String: [String: String]] and extract the map keys as the dependency list. Conditions are dropped since Apple Container has no equivalent orchestration-layer concept.

} else if let dependsOnMap = try? container.decodeIfPresent([String: [String: String]].self, forKey: .depends_on) {
    // Map form: depends_on: { db: { condition: service_healthy } }
    // Preserve dependency order; conditions are not applicable to Apple Container.
    depends_on = dependsOnMap.keys.sorted()
}

Tests

Added parseComposeWithDependenciesMapForm covering:

• Two dependencies with different condition values (service_healthy, service_started)
• Both service names extracted correctly
• Count assertion

Both new and existing depends_on tests pass.

Verified against

Windmill CE docker-compose.yml — previously failed at parse, now reaches image pull stage.