Turn 'getJpackageResources' into ConfigurableFileCollection

This allows it to be non-existing.

Author: jjohannes

src/main/java/org/gradlex/javamodule/packaging/JavaModulePackagingExtension.java

@@ -248,7 +248,7 @@ private void registerTargetSpecificTasks(Target target, String applicationJarTas
             t.getModulePath().from(runtimeClasspath);
 
             t.getApplicationName().convention(getApplicationName());
-            t.getJpackageResources().convention(getJpackageResources().dir(target.getOperatingSystem()));
+            t.getJpackageResources().from(getJpackageResources().dir(target.getOperatingSystem()));
             t.getApplicationDescription().convention(getApplicationDescription());
             t.getVendor().convention(getVendor());
             t.getCopyright().convention(getCopyright());

src/main/java/org/gradlex/javamodule/packaging/tasks/Jpackage.java

@@ -26,7 +26,6 @@
 import org.gradle.api.tasks.CacheableTask;
 import org.gradle.api.tasks.Classpath;
 import org.gradle.api.tasks.Input;
-import org.gradle.api.tasks.InputDirectory;
 import org.gradle.api.tasks.InputFiles;
 import org.gradle.api.tasks.Internal;
 import org.gradle.api.tasks.Nested;
@@ -81,9 +80,9 @@ abstract public class Jpackage extends DefaultTask {
     @Optional
     abstract public Property<String> getApplicationDescription();
 
-    @InputDirectory
+    @InputFiles
     @PathSensitive(PathSensitivity.RELATIVE)
-    abstract public DirectoryProperty getJpackageResources();
+    abstract public ConfigurableFileCollection getJpackageResources();
 
     @InputFiles
     @PathSensitive(PathSensitivity.RELATIVE)

src/test/java/org/gradlex/javamodule/packaging/test/fixture/GradleBuild.java

@@ -53,11 +53,6 @@ public GradleBuild(Path dir) {
         this.libBuildFile = file("lib/build.gradle.kts");
         this.libModuleInfoFile = file("lib/src/main/java/module-info.java");
 
-        // https://github.com/gradlex-org/java-module-packaging/issues/56 ?
-        projectDir.dir("app/src/main/resourcesPackage/windows");
-        projectDir.dir("app/src/main/resourcesPackage/macos");
-        projectDir.dir("app/src/main/resourcesPackage/linux");
-
         settingsFile.writeText("""
             dependencyResolutionManagement { repositories.mavenCentral() }
             includeBuild(".")