build: add main class info

Author: Stream29

build.gradle.kts

@@ -3,6 +3,7 @@ plugins {
     alias(libs.plugins.graalvm.buildtools)
     alias(libs.plugins.gradleup.shadow)
     alias(libs.plugins.kotlin.serialization)
+    application
 }
 
 group = "io.github.stream29"
@@ -42,6 +43,10 @@ kotlin {
     jvmToolchain(21)
 }
 
+application {
+    mainClass.set("io.github.stream29.proxy.MainKt")
+}
+
 graalvmNative {
     binaries {
         named("main") {