Add lightweight Dockerized ASP.NET Core sample

[balajibashyam]

Summary

Adds a minimal .NET 10 companion sample for the Dockerizing ASP.NET Core: Multi-Stage Builds, Clean Images & a Production-Ready Ship Workflow tutorial.

What's included

• New sample: cloud-native/dockerize-aspnet-core-clean-images — 14 files

  • Multi-stage Dockerfile with separate restore and publish stages
  • Committed package lock files with --locked-mode restore
  • Runtime-only final image using mcr.microsoft.com/dotnet/aspnet:10.0-noble
  • Non-root execution via $APP_UID
  • Port 8080 with ASPNETCORE_HTTP_PORTS
  • Liveness, readiness, and combined health endpoints
  • .NET-based Docker health probe (ContainerHealthProbe)
  • Runtime configuration through Sample__Message
  • Read-only filesystem, dropped capabilities, no-new-privileges
  • Hardened compose.yaml
  • 5 xUnit v3 integration tests

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

• GitHub Actions: New test-dockerized-aspnet-core job in the shared workflow; path filters updated

Deliberately omitted (stays in the full tutorial)

Database, authentication, secrets, private feeds, build secrets, image publishing, cloud deployment, Kubernetes, multi-architecture builds, image signing, vulnerability scanning, fixed image-size targets, production restart policy.

Versions

• .NET SDK: 10.0.302
• Microsoft.AspNetCore.Mvc.Testing: 10.0.10
• Microsoft.NET.Test.Sdk: 18.8.1
• xunit.v3: 3.2.2
• xunit.runner.visualstudio: 3.1.5

Validation

• dotnet restore — passed
• dotnet build --configuration Release — passed (0 errors, 0 warnings)
• dotnet test --configuration Release — passed (5/5)
• Docker image build — passed
• Container health check — healthy
• HTTP endpoints — all 200 OK
• Non-root user — verified (UID 1654)
• SDK absence in runtime — verified
• Docker Compose config — valid
• Docker Compose runtime — healthy, configuration override verified
• Security scan — clean