#2418 updating jpackage config (#2713)

# Description

Updating the `jpackage` configuration in our build.gradle and CI to
enable installation of the app on multiple OSs

Closes #2418 

## Checklist

- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] I have performed a self-review of my own code
- [x] I have attached images of the change if it is UI based
- [x] I have commented my code, particularly in hard-to-understand areas
- [x] If my code has heavily changed functionality I have updated
relevant docs on [Stirling-PDFs doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
- [x] My changes generate no new warnings
- [x] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

build.gradle

@@ -111,18 +111,15 @@ def getMacVersion(String version) {
 
 jpackage {
     input = "build/libs"
-
+    destination = "${projectDir}/build/jpackage"
+    mainJar = "Stirling-PDF-${project.version}.jar"
     appName = "Stirling-PDF"
     appVersion = project.version
     vendor = "Stirling-Software"
-	appDescription = "Stirling PDF - Your Local PDF Editor"
-
-    mainJar = "Stirling-PDF-${project.version}.jar"
-    mainClass = "org.springframework.boot.loader.launch.JarLauncher"
-
+    appDescription = "Stirling PDF - Your Local PDF Editor"
     icon = "src/main/resources/static/favicon.ico"
-
-
+    verbose = true
+//    mainClass = "org.springframework.boot.loader.launch.JarLauncher"
 
     // JVM Options
     javaOptions = [
@@ -136,14 +133,9 @@ jpackage {
         "--add-opens=java.desktop/sun.awt.X11=ALL-UNNAMED",
         "--add-opens=java.desktop/sun.awt.windows=ALL-UNNAMED",
         "--add-opens=java.desktop/sun.lwawt=ALL-UNNAMED",
-        "--add-opens=java.desktop/sun.lwawt.macosx=ALL-UNNAMED"
+        "--add-opens=java.desktop/sun.lwawt.macosx=ALL-UNNAMED",
     ]
 
-
-    verbose = true
-
-    destination = "${projectDir}/build/jpackage"
-
     // Windows-specific configuration
     windows {
     	launcherAsService = false