Add Aspire AppHost orchestration to samples with Aspire 13.1.0

[Copilot]

Summary of the changes (Less than 80 chars)

• Add Aspire 13.1.0 AppHost project for sample orchestration
• Update samples to use named Azure SignalR connections
• Add auto mode and environment variable support to C# client
• Install Aspire workload in CI workflows

Changes

Aspire Integration

• New Samples.AppHost project using Aspire.Hosting.AppHost 13.1.0 and Aspire.Hosting.Azure.SignalR 13.1.0
• Orchestrates ChatSample server, C# client with automatic Azure SignalR provisioning
• Configures Standard S1 SKU for SignalR resource

Sample Updates

• ChatSample now uses AddNamedAzureSignalR("signalr1") instead of hardcoded credentials
• C# client supports ServerEndpoint and MODE environment variables for Aspire orchestration
• Added auto broadcast mode with cancellation support for automated testing

CI/CD

• Added dotnet workload install aspire step to Windows, Ubuntu, and macOS workflows

Example Usage

Run with Aspire (auto-provisions Azure resources):

cd samples/Samples.AppHost
dotnet run

Or configure manually:

dotnet user-secrets set ConnectionStrings:signalr1 "<connection-string>"

See updated README in ChatSample for detailed instructions.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• 1javsblobprodcus364.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build AzureSignalR.sln (dns block)
  • Triggering command: /usr/bin/dotnet dotnet restore --no-dependencies /home/REDACTED/work/azure-signalr/azure-signalr/AzureSignalR.sln --packages /home/REDACTED/work/azure-signalr/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/azure-signalr/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/azure-signalr/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot (dns block)
• 1s1vsblobprodcus386.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build AzureSignalR.sln (dns block)
  • Triggering command: /usr/bin/dotnet dotnet restore --no-dependencies /home/REDACTED/work/azure-signalr/azure-signalr/AzureSignalR.sln --packages /home/REDACTED/work/azure-signalr/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/azure-signalr/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/azure-signalr/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot (dns block)
• kmuvsblobprodcus389.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build AzureSignalR.sln (dns block)
  • Triggering command: /usr/bin/dotnet dotnet restore --no-dependencies /home/REDACTED/work/azure-signalr/azure-signalr/AzureSignalR.sln --packages /home/REDACTED/work/azure-signalr/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/azure-signalr/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/azure-signalr/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot (dns block)
• n3kvsblobprodcus335.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build AzureSignalR.sln (dns block)
  • Triggering command: /usr/bin/dotnet dotnet restore --no-dependencies /home/REDACTED/work/azure-signalr/azure-signalr/AzureSignalR.sln --packages /home/REDACTED/work/azure-signalr/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/azure-signalr/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/azure-signalr/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot (dns block)
• pe3vsblobprodcus354.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build AzureSignalR.sln (dns block)
  • Triggering command: /usr/bin/dotnet dotnet restore (dns block)
  • Triggering command: /usr/bin/dotnet dotnet restore --no-dependencies /home/REDACTED/work/azure-signalr/azure-signalr/AzureSignalR.sln --packages /home/REDACTED/work/azure-signalr/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/azure-signalr/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/azure-signalr/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot (dns block)
• pkvvsblobprodcus321.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build AzureSignalR.sln (dns block)
  • Triggering command: /usr/bin/dotnet dotnet restore --no-dependencies /home/REDACTED/work/azure-signalr/azure-signalr/AzureSignalR.sln --packages /home/REDACTED/work/azure-signalr/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/azure-signalr/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/azure-signalr/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Create a pull request, as similar to what #2037 has done, add aspire apphost to samples using the latest aspire.

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