use ktor native fatJar task

apps/vbox/backend/Dockerfile

@@ -1,6 +1,6 @@
 FROM bellsoft/liberica-openjdk-alpine:21
 
 WORKDIR /usr/local/app
-COPY ./build/libs/server-fat-1.0.jar ./server-fat-1.0.jar
+COPY ./build/libs/server-fat.jar ./server-fat.jar
 EXPOSE 8181
-CMD ["java", "-jar", "server-fat-1.0.jar"]
+CMD ["java", "-jar", "server-fat.jar"]

apps/vbox/backend/build.gradle.kts

@@ -64,25 +64,18 @@ application {
     applicationDefaultJvmArgs = listOf("-Dio.ktor.development=$isDevelopment")
 }
 
+ktor {
+    fatJar {
+        archiveFileName.set("server-fat.jar")
+    }
+}
+
 tasks {
-    register("fatJar", Jar::class) {
-        archiveBaseName = "server-fat"
-        manifest {
-            attributes["Implementation-Title"] = "Videobox Server"
-            attributes["Implementation-Version"] = version
-            attributes["Main-Class"] = mainClassName
+    named("build") {
+        dependsOn("buildFatJar")
     }
-        from(configurations.runtimeClasspath.get().map { if (it.isDirectory) it else zipTree(it) })
-        duplicatesStrategy = DuplicatesStrategy.WARN
-        with(jar.get() as CopySpec)
-    }
-
-    "build" {
-        dependsOn("fatJar")
-    }
-
     register<Exec>("deployRemote") {
-        dependsOn("fatJar")
+        dependsOn("buildFatJar")
         commandLine(
             getCommandLine(
                 "docker context use remote",
@@ -92,9 +85,8 @@ tasks {
         )
         notCompatibleWithConfigurationCache("This task uses Exec which is not compatible with configuration cache")
     }
-
     register<Exec>("deployLocal") {
-        dependsOn("fatJar")
+        dependsOn("buildFatJar")
         commandLine(
             getCommandLine(
                 "docker compose down",
@@ -104,6 +96,7 @@ tasks {
         notCompatibleWithConfigurationCache("This task uses Exec which is not compatible with configuration cache")
     }
 }
+
 private fun getCommandLine(vararg commands: String): List<String> {
     val osName = System.getProperty("os.name").lowercase()
     return if (osName.contains("win")) {