Add method to create YarpCluster with a list of string as addresses

[benjaminpetit]

Description

Add a method to build a YarpCluster with a collection of string to use as addresses.

Fixes #10751

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No
• Does the change require an update in our Aspire docs?
  • Yes
    • Link to aspire-docs issue (consider using one of the following templates):
      • New (or update) doc-idea template
      • New breaking-change template
      • New diagnostic template
  • No

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.sh | bash -s -- 11368

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 11368"

[Copilot]

Pull Request Overview

This PR adds a new constructor to the YarpCluster class that accepts a list of string addresses, enabling load balancing across multiple endpoints. This change resolves issue #10751 by allowing YARP clusters to target multiple destinations directly from string addresses.

• Adds a new YarpCluster constructor that accepts a params string[] addresses parameter
• Updates the internal data structure from a single Target to an array of Targets
• Modifies the environment variable generation to support multiple destinations

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/Aspire.Hosting.Yarp/ConfigurationBuilder/YarpCluster.cs	Adds new constructor for string addresses and changes internal structure to support multiple targets
src/Aspire.Hosting.Yarp/YarpEnvConfigGenerator.cs	Updates environment variable generation to iterate through multiple targets
tests/Aspire.Hosting.Yarp.Tests/YarpClusterTests.cs	Adds test for new constructor and updates existing tests to use new Targets array

[benjaminpetit]

Not a big fan to have a string and then an optional addrya for the list of addresses. We could use Uri instead?

[davidfowl]

This allows for creating a cluster without any destinations, I think we need to support passing an array not params