Configure ShadowJar for fat jar generation and update workflow

build.gradle.kts

@@ -1,6 +1,7 @@
 plugins {
     id("java")
     id("application")
+    id("com.github.johnrengelman.shadow") version "8.1.1"
 }
 
 group = "net.jstom"
@@ -30,6 +31,13 @@ application {
     mainClass.set("net.jstom.Main")
 }
 
+tasks {
+    shadowJar {
+        mergeServiceFiles()
+        archiveClassifier.set("") // Remove '-all' suffix so it replaces the default jar or just sits nicely
+    }
+}
+
 java {
     toolchain {
         languageVersion.set(JavaLanguageVersion.of(25))