fixed jar task

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

de.srsoftware.oidc.app/build.gradle.kts

@@ -1,5 +1,9 @@
 description = "SRSoftware OIDC: app"
 
+plugins {
+    java
+}
+
 dependencies{
     implementation("org.json:json:20240303")
     implementation("de.srsoftware:tools.http:1.0.1")
@@ -12,3 +16,13 @@ dependencies{
     implementation(project(":de.srsoftware.oidc.datastore.file"))
     implementation(project(":de.srsoftware.oidc.web"))
 }
+
+tasks.jar {
+    manifest.attributes["Main-Class"] = "de.srsoftware.oidc.app.Application"
+    duplicatesStrategy = DuplicatesStrategy.EXCLUDE
+     val dependencies = configurations
+        .runtimeClasspath
+        .get()
+        .map(::zipTree) // OR .map { zipTree(it) }
+    from(dependencies)
+}