close and release publication plugin

@@ -16,14 +16,12 @@ buildscript {
         classpath "org.jetbrains.kotlin:kotlin-serialization:$kotlin_version"
         classpath "org.jetbrains.dokka:dokka-gradle-plugin:$dokka_version"
         classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.15'
+        classpath "io.codearte.gradle.nexus:gradle-nexus-staging-plugin:0.30.0"
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
     }
 }
-
-plugins {
-    id "org.jetbrains.dokka" version "$dokka_version"
-}
+apply plugin: 'io.codearte.nexus-staging'
 
 allprojects {
     repositories {
@@ -38,6 +36,12 @@ task clean(type: Delete) {
     delete rootProject.buildDir
 }
 
+nexusStaging {
+    serverUrl = "https://s01.oss.sonatype.org/service/local/"
+    packageGroup = GROUP
+    stagingProfileId = "16b57cbf143daa"
+}
+
 ext {
     androidSdk = [
             compileVersion: 29,

@@ -40,11 +40,11 @@ def getSnapshotRepositoryUrl() {
 }
 
 def getRepositoryUsername() {
-    return hasProperty('NEXUS_USERNAME') ? NEXUS_USERNAME : ""
+    return hasProperty('nexusUsername') ? NEXUS_USERNAME : ""
 }
 
 def getRepositoryPassword() {
-    return hasProperty('NEXUS_PASSWORD') ? NEXUS_PASSWORD : ""
+    return hasProperty('nexusPassword') ? NEXUS_PASSWORD : ""
 }
 
 def configurePom(pom) {