Adds Java package publishing

.github/workflows/build.yml

@@ -55,6 +55,12 @@ jobs:
         run: gradle test
         working-directory: ./java
 
+      - name: Publish Java release
+        run: gradle publish
+        working-directory: ./java
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
   windows:
     name: Test on Windows
     runs-on: windows-latest

java/lib/build.gradle.kts

@@ -1,24 +1,20 @@
 plugins {
-    // Apply the java-library plugin for API and implementation separation.
-    `java-library`
+    `maven-publish` // Apply the maven-publish plugin before java-library for publishing to GitHub Packages.
+    `java-library`  // Apply the java-library plugin for API and implementation separation.
 }
 
+group = "dev.arkbuilders"
+version = "1.0-SNAPSHOT"
+
 repositories {
-    // Use Maven Central for resolving dependencies.
-    mavenCentral()
+    mavenCentral()  // Use Maven Central for resolving dependencies.
 }
 
 dependencies {
-    // Use JUnit Jupiter for testing.
-    testImplementation(libs.junit.jupiter)
-
+    testImplementation(libs.junit.jupiter) // Use JUnit Jupiter for testing.
     testRuntimeOnly("org.junit.platform:junit-platform-launcher")
-
-    // This dependency is exported to consumers, that is to say found on their compile classpath.
-    api(libs.commons.math3)
-
-    // This dependency is used internally, and not exposed to consumers on their own compile classpath.
-    implementation(libs.guava)
+    api(libs.commons.math3)     // This dependency is exported to consumers, that is to say found on their compile classpath.
+    implementation(libs.guava)  // This dependency is used internally, and not exposed to consumers on their own compile classpath.
 }
 
 // Apply a specific Java toolchain to ease working on different environments.
@@ -29,14 +25,31 @@ java {
 }
 
 tasks.named<Test>("test") {
-    // Use JUnit Platform for unit tests.
-    useJUnitPlatform()
-    // Set the JVM argument for the java.library.path (To import rust compiled library)
-    val rustLibPath = projectDir.resolve("../../target/release").absolutePath
+    val rustLibPath = projectDir.resolve("../../target/release").absolutePath  // Set the JVM argument for the java.library.path (To import rust compiled library)
+    useJUnitPlatform()                                                         // Use JUnit Platform for unit tests.
     jvmArgs = listOf("-Djava.library.path=$rustLibPath")
 }
 
 tasks.named<Javadoc>("javadoc") {
     options.encoding = "UTF-8"
     options.memberLevel = JavadocMemberLevel.PUBLIC
 }
+
+publishing {
+    // Define a Maven publication for the 'maven' repository
+    publications {
+        create<MavenPublication>("Maven") {
+            from(components["java"])
+        }
+    }
+    repositories {
+        maven {
+            name = "GitHubPackages"
+            url = uri("https://maven.pkg.github.com/ARK-Builders/ark-core")
+            credentials {
+                username = System.getenv("GITHUB_ACTOR")
+                password = System.getenv("GITHUB_TOKEN")
+            }
+        }
+    }
+}