Fix bug in update manifest generation.

src/main/kotlin/gay/pizza/foundation/concrete/ExtensibleManifest.kt

@@ -19,7 +19,7 @@ data class ExtensibleManifestItem(
    */
   val name: String,
   /**
-   * The type of item, for example "bukkit-plugin"
+   * The type of item.
    */
   val type: String,
   /**
@@ -33,7 +33,7 @@ data class ExtensibleManifestItem(
   /**
    * The files that are required to install the item.
    */
-  val files: List<String>
+  val files: List<ExtensibleManifestItemFile>
 )
 
 /**
@@ -45,7 +45,7 @@ data class ExtensibleManifestItemFile(
    */
   val name: String,
   /**
-   * A type of file. For example: "plugin-jar".
+   * A type of file.
    */
   val type: String,
   /**

src/main/kotlin/gay/pizza/foundation/concrete/UpdateManifestTask.kt

@@ -4,6 +4,7 @@ import org.gradle.api.DefaultTask
 import org.gradle.api.tasks.TaskAction
 import java.nio.file.Files
 import java.nio.file.Path
+import kotlin.io.path.name
 
 open class UpdateManifestTask : DefaultTask() {
   @TaskAction
@@ -33,7 +34,17 @@ open class UpdateManifestTask : DefaultTask() {
         type = "bukkit-plugin",
         version = project.version.toString(),
         dependencies = dependencies,
-        files = paths.map { it.toUnixString() }
+        files = paths.map { path ->
+          var type = "unknown"
+          if (path.name.endsWith("-plugin.jar")) {
+            type = "plugin-jar"
+          }
+          ExtensibleManifestItemFile(
+            name = path.name,
+            type = type,
+            path = path.toUnixString()
+          )
+        }
       )
     }