Add lightweight Aspire orchestration sample

[balajibashyam]

Summary

Adds a minimal .NET 10 Aspire companion sample for the Aspire in .NET: Orchestrate, Run, and Deploy a Distributed System from One App Host tutorial.

What's included

• New sample: dotnet-aspire/orchestrate-distributed-system/ — 8 files

  • A real Aspire AppHost coordinating one API project and one web project
  • Service discovery through https+http://api (no fixed localhost port)
  • WithReference(api) + WaitFor(api)
  • WithExternalHttpEndpoints()
  • Web-to-API communication resolved by the AppHost

• Root README: New sample row in the table + updated repository structure

• GitHub Actions: New build-aspire-orchestration job in the shared workflow; path filters updated

Deliberately omitted (stays in the full tutorial)

PostgreSQL, Redis, EF Core, Npgsql, caching, ServiceDefaults, health checks, Aspire.Hosting.Testing, integration tests, OpenTelemetry customization, GenAI, publish/deploy, Azure, Kubernetes, Helm

Versions

• .NET SDK: 10.0.302
• Aspire.Hosting.AppHost: 13.4.6
• Microsoft.Extensions.ServiceDiscovery: 10.8.0

Validation

• dotnet restore — passed
• dotnet build --configuration Release — passed
• Security scan (secrets, fixed ports, machine paths) — clean
• Runtime/dashboard — not possible on headless VPS (DCP/Dashboard binaries unavailable)