feat: add Maven publication configuration and update group property assignment

Author: ptthanh02

api/build.gradle.kts

@@ -4,3 +4,12 @@ dependencies {
     annotationProcessor("org.projectlombok:lombok:1.18.42")
 }
 
+publishing {
+    publications {
+        create<MavenPublication>("mavenJava") {
+            from(components["java"])
+            artifactId = "api"
+        }
+    }
+}
+

build.gradle.kts

@@ -9,7 +9,7 @@ allprojects {
     apply(plugin = "java")
     apply(plugin = "maven-publish")
 
-    group = if (System.getenv("JITPACK") != null) "com.github.NighterDevelopment" else "github.nighter"
+    group = "github.nighter"
     version = "1.6.1"
 
     repositories {