Switch to the Vanniktech base plugin for publishing (#1450)

* Switch to the Vanniktech base plugin for publishing

Move configuration out of build.gradle files and into build.gradle.kts files.
Sign published builds.
Support publishing release builds from GitHub actions.

* Update build.gradle.kts

Co-authored-by: Zac Sweers <zac.sweers@gmail.com>

Co-authored-by: Zac Sweers <zac.sweers@gmail.com>

moshi/build.gradle.kts

@@ -14,11 +14,16 @@
  * limitations under the License.
  */
 
+import com.vanniktech.maven.publish.JavadocJar.Javadoc
+import com.vanniktech.maven.publish.KotlinJvm
+import com.vanniktech.maven.publish.MavenPublishBaseExtension
+import org.gradle.jvm.tasks.Jar
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
   kotlin("jvm")
-  id("com.vanniktech.maven.publish")
+  id("com.vanniktech.maven.publish.base")
+  id("org.jetbrains.dokka")
 }
 
 val mainSourceSet by sourceSets.named("main")
@@ -80,3 +85,13 @@ dependencies {
   testImplementation(libs.junit)
   testImplementation(libs.truth)
 }
+
+tasks.withType<Jar>().configureEach {
+  manifest {
+    attributes("Automatic-Module-Name" to "com.squareup.moshi")
+  }
+}
+
+configure<MavenPublishBaseExtension> {
+  configure(KotlinJvm(javadocJar = Javadoc()))
+}

moshi/gradle.properties

@@ -1,20 +0,0 @@
-#
-# Copyright (C) 2020 Square, Inc.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#    https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-
-POM_NAME=Moshi
-POM_ARTIFACT_ID=moshi
-POM_PACKAGING=jar
-AUTOMATIC_MODULE_NAME=com.squareup.moshi