[release/8.0][wasm] Use intended ports when running DevServer (#92906)

* [wasm] Ignore empty `$ASPNETCORE_URLS`

* [wasm] DevServer: honor urls specified in the options

* [wasm] CI: Don't trigger non-wbt jobs on wasm-app-host changes

* CI: don't trigger wasm runtime tests on wasm-app-host changes

* [wasm] wasmbrowser - change the default webserver port to 0, to randomly select a port

Author: radical

eng/pipelines/common/evaluate-default-paths.yml

@@ -241,6 +241,7 @@ jobs:
       - src/mono/tools/*
       - src/mono/wasi/*
       - src/mono/wasm/debugger/*
+      - src/mono/wasm/host/*
       - src/mono/wasm/Wasm.Build.Tests/*
       - ${{ parameters._const_paths._wasm_pipelines }}
       - ${{ parameters._const_paths._always_exclude }}
@@ -258,6 +259,7 @@ jobs:
       - eng/testing/workloads-testing.targets
       - src/mono/mono/component/mini-wasm-debugger.c
       - src/mono/wasm/debugger/*
+      - src/mono/wasm/host/*
       - src/mono/wasm/Wasm.Build.Tests/*
       - src/mono/nuget/Microsoft.NET.Runtime*
         src/mono/nuget/Microsoft.NET.Sdk.WebAssembly.Pack/*

src/mono/wasm/host/BrowserHost.cs

@@ -74,7 +74,7 @@ private async Task RunAsync(ILoggerFactory loggerFactory, CancellationToken toke
                                                debugging: _args.CommonConfig.Debugging);
         runArgsJson.Save(Path.Combine(_args.CommonConfig.AppPath, "runArgs.json"));
 
-        string[] urls = envVars.TryGetValue("ASPNETCORE_URLS", out string? aspnetUrls)
+        string[] urls = (envVars.TryGetValue("ASPNETCORE_URLS", out string? aspnetUrls) && aspnetUrls.Length > 0)
                             ? aspnetUrls.Split(';', StringSplitOptions.RemoveEmptyEntries)
                             : new string[] { $"http://127.0.0.1:{_args.CommonConfig.HostProperties.WebServerPort}", "https://127.0.0.1:0" };
 

src/mono/wasm/host/DevServer/DevServer.cs

@@ -46,7 +46,8 @@ internal static class DevServer
                 services.AddSingleton(Options.Create(options));
                 services.AddSingleton(realUrlsAvailableTcs);
                 services.AddRouting();
-            });
+            })
+            .UseUrls(options.Urls);
 
 
         IWebHost? host = builder.Build();

src/mono/wasm/host/RuntimeConfigJson.cs

@@ -24,7 +24,7 @@ internal sealed record WasmHostProperties(
      int? FirefoxDebuggingPort,
      int? ChromeProxyPort,
      int? ChromeDebuggingPort,
-     int WebServerPort = 9000)
+     int WebServerPort = 0)
 {
     // using an explicit property because the deserializer doesn't like
     // extension data in the record constructor