[ci skip] Add Maven publish plugin configuration

Integrate the Maven publish plugin to build.gradle.kts for publishing artifacts. Configure script to handle snapshots and releases based on version, and set up repository credentials using environment variables.

build.gradle.kts

@@ -1,5 +1,6 @@
 plugins {
     id("java")
+    id("maven-publish")
 }
 
 group = "net.thenextlvl.resolver"
@@ -37,4 +38,18 @@ dependencies {
 
 tasks.test {
     useJUnitPlatform()
+}
+
+publishing {
+    publications.create<MavenPublication>("maven") {
+        from(components["java"])
+    }
+    repositories.maven {
+        val channel = if ((version as String).contains("-pre")) "snapshots" else "releases"
+        url = uri("https://repo.thenextlvl.net/$channel")
+        credentials {
+            username = System.getenv("REPOSITORY_USER")
+            password = System.getenv("REPOSITORY_TOKEN")
+        }
+    }
 }