fix: Fix copyPlugins with shadow

Author: osipxd

src/main/kotlin/server/DevServerPlugin.kt

@@ -122,13 +122,12 @@ public class DevServerPlugin : Plugin<Project> {
         copyServerCore: TaskProvider<Copy>,
         serverDir: Provider<Directory>
     ): TaskProvider<PrepareServer> {
-        val jarTaskName = if (project.plugins.hasPlugin("com.github.johnrengelman.shadow")) "shadowJar" else "jar"
-        val jarTask = tasks.named<Jar>(jarTaskName)
         val copyPlugins = tasks.register<Copy>("copyPlugins") {
             group = TASKS_GROUP_BUKKIT
             description = "Copy plugins to dev server."
 
-            from(jarTask)
+            val jarTaskName = if (project.plugins.hasPlugin("com.github.johnrengelman.shadow")) "shadowJar" else "jar"
+            from(tasks.named<Jar>(jarTaskName))
             into(serverDir.map { project.mkdir(it.dir("plugins")) })
             rename { "${pluginMeta.name.get()}.jar" }
         }

src/test/groovy/ru/endlesscode/bukkitgradle/server/task/PrepareServerSpec.groovy

@@ -55,4 +55,23 @@ class PrepareServerSpec extends PluginSpecification {
         and: "online-mode should be false"
         file("$serverDir/server.properties").readLines().contains("online-mode=false")
     }
+
+    def "when run prepareServer - and there is shadow plugin - should use shadowJar task"() {
+        given: "configured eula and online-mode"
+        buildFile.text = """
+            plugins {
+                id "ru.endlesscode.bukkitgradle"
+                id "com.github.johnrengelman.shadow" version "6.1.0"
+            }
+
+            version = '1.0'
+            group = 'com.example.testplugin'
+        """.stripIndent()
+
+        when: "run prepareServer"
+        run(TASK_NAME, '-x', 'copyServer')
+
+        then: "should run shadowJar"
+        taskOutcome(":shadowJar") == TaskOutcome.SUCCESS
+    }
 }