Fail benchmarks if any errors (#384)

Fail the benchmarks if any errors are encountered during execution.

Author: martincostello

benchmark.ps1

@@ -91,3 +91,8 @@ if (-Not [string]::IsNullOrEmpty(${env:GITHUB_SHA})) {
 }
 
 & $dotnet run --project $benchmarks --configuration "Release" -- $additionalArgs
+
+if ($LASTEXITCODE -ne 0) {
+    Write-Error "Benchmarks failed with exit code $LASTEXITCODE."
+    exit $LASTEXITCODE
+}

perf/TodoApp.Benchmarks/Program.cs

@@ -19,8 +19,11 @@
     {
         await benchmarks.StopServer();
     }
+
+    return 0;
 }
 else
 {
-    BenchmarkRunner.Run<OpenApiBenchmarks>(args: args);
+    var summary = BenchmarkRunner.Run<OpenApiBenchmarks>(args: args);
+    return summary.Reports.Any((p) => !p.Success) ? 1 : 0;
 }