Make main class configurable for smoke test apps

Co-authored-by: xiang17 <9310587+xiang17@users.noreply.github.com>

Author: Copilot

buildSrc/src/main/kotlin/ai.smoke-test-jar.gradle.kts

@@ -15,9 +15,15 @@ tasks.named<ShadowJar>("shadowJar") {
   archiveClassifier.set("")
   mergeServiceFiles()
 
-  // Use the standard main class convention for smoke test apps
+  // Set main class - can be overridden by individual projects via mainClassName property
   manifest {
-    attributes["Main-Class"] = "com.microsoft.applicationinsights.smoketestapp.SpringBootApp"
+    val mainClass = if (project.hasProperty("mainClassName")) {
+      project.property("mainClassName") as String
+    } else {
+      // Default main class for most smoke test apps
+      "com.microsoft.applicationinsights.smoketestapp.SpringBootApp"
+    }
+    attributes["Main-Class"] = mainClass
   }
 }
 

smoke-tests/apps/JettyNativeHandler/build.gradle.kts

@@ -2,6 +2,9 @@ plugins {
   id("ai.smoke-test-jar")
 }
 
+// Override default main class
+ext.set("mainClassName", "com.microsoft.applicationinsights.smoketestapp.JettyNativeHandlerApp")
+
 dependencies {
   implementation("org.springframework.boot:spring-boot-starter:2.5.12")
 

smoke-tests/apps/ReadOnly/build.gradle.kts

@@ -1,3 +1,6 @@
 plugins {
   id("ai.smoke-test-jar")
 }
+
+// Override default main class
+ext.set("mainClassName", "com.microsoft.applicationinsights.smoketestapp.App")