Add "publish to Maven local" to Plugin-API

plugin-api/build.gradle.kts

@@ -1,5 +1,6 @@
 plugins {
     kotlin("jvm")
+    `maven-publish`
 }
 
 group = "de.grimsi.gameyfin"
@@ -8,6 +9,14 @@ repositories {
     mavenCentral()
 }
 
+publishing {
+    publications {
+        create<MavenPublication>("maven") {
+            from(components["java"])
+        }
+    }
+}
+
 dependencies {
     // PF4J (shared)
     api("org.pf4j:pf4j:${rootProject.extra["pf4jVersion"]}")