Build updates

build.gradle.kts

@@ -21,6 +21,15 @@ subprojects {
             languageVersion = JavaLanguageVersion.of(21)
         }
     }
+
+    dependencies {
+        "testRuntimeOnly"("org.junit.platform:junit-platform-launcher")
+    }
+
+    tasks.withType<AbstractArchiveTask>().configureEach {
+        isPreserveFileTimestamps = false
+        isReproducibleFileOrder = true
+    }
 }
 
 val paperMavenPublicUrl = "https://repo.papermc.io/repository/maven-public/"