build: Fix duplicate publication

KMP already creates one.

build.gradle.kts

@@ -1,3 +1,5 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
 plugins {
     alias(libs.plugins.android.library)
     alias(libs.plugins.binary.compatibility.validator)
@@ -29,18 +31,14 @@ repositories {
 
 kotlin {
     jvm {
-        compilations.all {
-            kotlinOptions {
-                jvmTarget = JavaVersion.VERSION_11.toString()
-            }
+        compilerOptions {
+            jvmTarget = JvmTarget.JVM_11
         }
     }
 
     androidTarget {
-        compilations.all {
-            kotlinOptions {
-                jvmTarget = JavaVersion.VERSION_11.toString()
-            }
+        compilerOptions {
+            jvmTarget = JvmTarget.JVM_11
         }
 
         publishLibraryVariants("release")
@@ -98,15 +96,15 @@ publishing {
             name = "GitHubPackages"
             url = uri("https://maven.pkg.github.com/revanced/revanced-library")
             credentials {
-                username = System.getenv("GITHUB_ACTOR")
-                password = System.getenv("GITHUB_TOKEN")
+                username = project.findProperty("gpr.user") as String? ?: System.getenv("GITHUB_ACTOR")
+                password = project.findProperty("gpr.key") as String? ?: System.getenv("GITHUB_TOKEN")
             }
         }
     }
 
-    publications {
-        create<MavenPublication>("revanced-library-publication") {
-            version = project.version.toString()
+    // KMP plugin creates a publication already, so just configure the POM.
+    publications.all {
+        if (this !is MavenPublication) return@all
 
         pom {
             name = "ReVanced Library"
@@ -136,9 +134,8 @@ publishing {
         }
     }
 }
-}
 
 signing {
     useGpgCmd()
-    sign(publishing.publications["revanced-library-publication"])
+    sign(publishing.publications)
 }