✨ Switch to Kotlin Multiplatform and update publishing plugin

Changed from JVM to Kotlin Multiplatform for broader compatibility,
adding multiple targets including JS, iOS, and Linux. Replaced old Maven
 publishing setup with Vanniktech Maven Publish plugin to simplify the
 configuration and deployment process.

Closes #7

Author: LeoColman

build.gradle.kts

@@ -1,8 +1,8 @@
-import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+import com.vanniktech.maven.publish.SonatypeHost
 
 plugins {
-  kotlin("jvm") version "2.0.21"
-  `maven-publish`
+  kotlin("multiplatform") version "2.0.21"
+  id("com.vanniktech.maven.publish") version "0.30.0"
   signing
   id("org.jetbrains.dokka") version "1.9.20"
   id("io.gitlab.arturbosch.detekt") version "1.23.7"
@@ -15,90 +15,70 @@ repositories {
   mavenCentral()
 }
 
-dependencies {
-  val kotestVersion = "5.9.1"
-  testImplementation("io.kotest:kotest-runner-junit5:$kotestVersion")
-  testImplementation("io.kotest:kotest-property:$kotestVersion")
-}
+kotlin {
+  applyDefaultHierarchyTemplate()
 
-tasks.withType<KotlinCompile> {
-  kotlinOptions.jvmTarget = "1.8"
-}
+  jvm()
+  js {
+    browser()
+    nodejs()
+  }
 
-kotlin {
-  jvmToolchain(8)
+  iosX64()
+  iosArm64()
+  iosSimulatorArm64()
+
+  macosX64()
+  macosArm64()
+
+  linuxX64()
+  linuxArm64()
+
+  sourceSets {
+    val jvmTest by getting {
+      dependencies {
+        val kotestVersion = "5.9.1"
+
+        implementation("io.kotest:kotest-runner-junit5:$kotestVersion")
+        implementation("io.kotest:kotest-property:$kotestVersion")
+      }
+    }
+  }
 }
 
 tasks.withType<Test> {
   useJUnitPlatform()
 }
 
-val sourcesJar by tasks.registering(Jar::class) {
-  archiveClassifier.set("sources")
-  from(sourceSets.getByName("main").allSource)
-}
+mavenPublishing {
+  publishToMavenCentral(SonatypeHost.DEFAULT)
+  signAllPublications()
 
-val javadocJar by tasks.registering(Jar::class) {
-  dependsOn("dokkaHtml")
-  archiveClassifier.set("javadoc")
-  from("$buildDir/dokka")
-}
+  pom {
+    name.set("SimpleCpfValidator")
+    description.set("Simple CPF Validator")
+    url.set("https://www.github.com/LeoColman/SimpleCpfValidator")
 
-publishing {
-  repositories {
-    maven("https://oss.sonatype.org/service/local/staging/deploy/maven2") {
-      credentials {
-        username = System.getenv("OSSRH_USERNAME")
-        password = System.getenv("OSSRH_PASSWORD")
-      }
+
+    scm {
+      connection.set("scm:git:http://www.github.com/LeoColman/SimpleCpfValidator/")
+      developerConnection.set("scm:git:http://github.com/LeoColman/")
+      url.set("https://www.github.com/LeoColman/SimpleCpfValidator")
     }
-  }
 
-  publications {
-    register("mavenJava", MavenPublication::class) {
-      from(components["java"])
-      artifact(sourcesJar.get())
-      artifact(javadocJar.get())
-
-      pom {
-        name.set("SimpleCpfValidator")
-        description.set("Simple CPF Validator")
-        url.set("https://www.github.com/LeoColman/SimpleCpfValidator")
-
-
-        scm {
-          connection.set("scm:git:http://www.github.com/LeoColman/SimpleCpfValidator/")
-          developerConnection.set("scm:git:http://github.com/LeoColman/")
-          url.set("https://www.github.com/LeoColman/SimpleCpfValidator")
-        }
-
-        licenses {
-          license {
-            name.set("The Apache 2.0 License")
-            url.set("https://opensource.org/licenses/Apache-2.0")
-          }
-        }
-
-        developers {
-          developer {
-            id.set("LeoColman")
-            name.set("Leonardo Colman Lopes")
-            email.set("[email protected]")
-          }
-        }
+    licenses {
+      license {
+        name.set("The Apache 2.0 License")
+        url.set("https://opensource.org/licenses/Apache-2.0")
       }
     }
-  }
-}
-
-val signingKey: String? by project
-val signingPassword: String? by project
 
-signing {
-  useGpgCmd()
-  if (signingKey != null && signingPassword != null) {
-    useInMemoryPgpKeys(signingKey, signingPassword)
+    developers {
+      developer {
+        id.set("LeoColman")
+        name.set("Leonardo Colman Lopes")
+        email.set("[email protected]")
+      }
+    }
   }
-
-  sign(publishing.publications["mavenJava"])
 }