Update Maven repository URL and add publishing configuration

Replaced old Maven repository URL with updated Altitude Nexus URL and secured credentials usage. Added a Maven publishing configuration to enable artifact publishing to the Altitude snapshot repository.

build.gradle.kts

@@ -2,6 +2,7 @@ import com.github.jengelman.gradle.plugins.shadow.tasks.ConfigureShadowRelocatio
 
 plugins {
     id("java")
+    id("maven-publish")
     id("com.github.johnrengelman.shadow") version "7.1.0"
 }
 
@@ -47,4 +48,23 @@ dependencies {
     // Velocity
     compileOnly("com.velocitypowered:velocity-api:3.1.2-SNAPSHOT") // Velocity
     annotationProcessor("com.velocitypowered:velocity-api:3.1.2-SNAPSHOT")
-}
+}
+
+publishing {
+    publications {
+        create<MavenPublication>("mavenJava") {
+            from(components["java"])
+        }
+    }
+
+    repositories{
+        maven {
+            name = "nexus"
+            url = uri("https://repo.alttd.com/repository/alttd-snapshot/")
+            credentials {
+                username = project.property("alttdSnapshotUsername") as String
+                password = project.property("alttdSnapshotPassword") as String
+            }
+        }
+    }
+}

settings.gradle.kts

@@ -1,13 +1,19 @@
 rootProject.name = "shutdowninfo"
 
+val nexusUser = providers.gradleProperty("alttdSnapshotUsername").get()
+val nexusPass = providers.gradleProperty("alttdSnapshotPassword").get()
+
 dependencyResolutionManagement {
     repositories {
         mavenCentral()
         // Altitude
         maven {
-            name = "maven"
-            url = uri("https://repo.destro.xyz/snapshots")
-            credentials(PasswordCredentials::class)
+            name = "nexus"
+            url = uri("https://repo.alttd.com/repository/alttd-snapshot/")
+            credentials {
+                username = nexusUser
+                password = nexusPass
+            }
         }
         // Velocity
         maven("https://nexus.velocitypowered.com/repository/maven-public/")