Adds AddStreamlitApp() extension method to host Streamlit applications in Aspire, using the Aspire.Hosting.Python integration.

Implementation

• StreamlitAppResource: Resource definition inheriting from PythonAppResource with service discovery support
• StreamlitAppHostingExtension: Extension method using AddPythonExecutable from Aspire.Hosting.Python
  • Configures Streamlit server with proper port, address, and headless mode settings
  • Supports virtual environment management via WithPip(), WithUv(), and WithVirtualEnvironment()
• Experimental Status: Marked with [Experimental("CTASPIRE001")] attribute as it relies on patterns that will be publicly exposed in Aspire 13.1

Usage

builder.AddStreamlitApp("myapp", "../path/to/app", "app.py")
    .WithHttpEndpoint(env: "PORT")
    .WithHttpHealthCheck("/health");

Note: This integration is experimental and subject to change. The implementation will be updated when AddPythonAppCore becomes publicly available in Aspire.Hosting.Python (expected in Aspire 13.1).

Testing

• Added unit test validating resource creation

• Added integration test to AppHost example (currently skipped per issue Review the Python extensions relative to the new Python hosting integration #917)

• Included minimal Streamlit example app in examples/python/streamlit-api/

• Experimental diagnostic warnings suppressed in tests and examples

• Fixes Add Streamlit to PythonExtention #953

Custom agent used: Hosting Integration Creator
This agent helps users create new hosting integration in Aspire by scaffolding the correct projects and files based on user input.

• Fixes Add Streamlit to PythonExtention #953

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