Template tests: Create dev cert only once (#31012)

Author: HaoK

src/ProjectTemplates/Shared/AspNetProcess.cs

@@ -35,6 +35,7 @@ public class AspNetProcess : IDisposable
         internal ProcessEx Process { get; }
 
         public AspNetProcess(
+            DevelopmentCertificate cert,
             ITestOutputHelper output,
             string workingDirectory,
             string dllPath,
@@ -44,8 +45,7 @@ public AspNetProcess(
             bool usePublishedAppHost = false,
             ILogger logger = null)
         {
-            _developmentCertificate = DevelopmentCertificate.Create(workingDirectory);
-
+            _developmentCertificate = cert;
             _output = output;
             _httpClient = new HttpClient(new HttpClientHandler()
             {

src/ProjectTemplates/Shared/Project.cs

@@ -40,6 +40,7 @@ public class Project : IDisposable
         public string TemplateOutputDir { get; set; }
         public string TargetFramework { get; set; } = GetAssemblyMetadata("Test.DefaultTargetFramework");
         public string RuntimeIdentifier { get; set; } = string.Empty;
+        public static DevelopmentCertificate DevCert { get; } = DevelopmentCertificate.Create(AppContext.BaseDirectory);
 
         public string TemplateBuildDir => Path.Combine(TemplateOutputDir, "bin", "Debug", TargetFramework, RuntimeIdentifier);
         public string TemplatePublishDir => Path.Combine(TemplateOutputDir, "bin", "Release", TargetFramework, RuntimeIdentifier, "publish");
@@ -178,7 +179,7 @@ internal AspNetProcess StartBuiltProjectAsync(bool hasListeningUri = true, ILogg
             }
 
             var projectDll = Path.Combine(TemplateBuildDir, $"{ProjectName}.dll");
-            return new AspNetProcess(Output, TemplateOutputDir, projectDll, environment, published: false, hasListeningUri: hasListeningUri, logger: logger);
+            return new AspNetProcess(DevCert, Output, TemplateOutputDir, projectDll, environment, published: false, hasListeningUri: hasListeningUri, logger: logger);
         }
 
         internal AspNetProcess StartPublishedProjectAsync(bool hasListeningUri = true, bool usePublishedAppHost = false)
@@ -193,7 +194,7 @@ internal AspNetProcess StartPublishedProjectAsync(bool hasListeningUri = true, b
             };
 
             var projectDll = Path.Combine(TemplatePublishDir, $"{ProjectName}.dll");
-            return new AspNetProcess(Output, TemplatePublishDir, projectDll, environment, published: true, hasListeningUri: hasListeningUri, usePublishedAppHost: usePublishedAppHost);
+            return new AspNetProcess(DevCert, Output, TemplatePublishDir, projectDll, environment, published: true, hasListeningUri: hasListeningUri, usePublishedAppHost: usePublishedAppHost);
         }
 
         internal async Task<ProcessResult> RunDotNetEfCreateMigrationAsync(string migrationName)