signing setup was not enough.

We cannot justify use of build.gradle.kts. As usual, Gradle user experience
is left horrible and you cannot simply include another gradle script in .kts.

alsa-javacpp/build.gradle

@@ -91,6 +91,8 @@ afterEvaluate {
             }
         }
 
+        apply from: "${rootDir}/publish-module.gradle"
+
         // keep it as is. It is replaced by CI release builds
         signing {}
     }

build.gradle.kts → build.gradle

@@ -6,6 +6,8 @@ repositories {
     mavenCentral()
 }
 
+apply from: "${rootDir}/publish-root.gradle"
+
 allprojects {
     group = "dev.atsushieno"
     version = "0.1.0"

publish-module.gradle

@@ -0,0 +1,31 @@
+
+tasks.register('javadocJar', Jar) {
+    archiveClassifier.set('javadoc')
+    from javadoc.destinationDir
+}
+tasks.register('sourceJar', Jar) {
+    archiveClassifier.set('sources')
+    from sourceSets.main.allSource
+    duplicatesStrategy(DuplicatesStrategy.EXCLUDE)
+}
+
+publishing {
+    publications {
+        maven(MavenPublication) {
+            artifact(javadocJar)
+            artifact(sourceJar)
+        }
+    }
+
+    repositories {
+        maven {
+            name = "OSSRH"
+            url = uri("https://s01.oss.sonatype.org/service/local/staging/deploy/maven2/")
+            credentials {
+                username = ossrhUsername
+                password = ossrhPassword
+            }
+        }
+    }
+}
+

publish-root.gradle

@@ -0,0 +1,38 @@
+// It is modified version of https://github.com/GetStream/stream-chat-android/blob/develop/scripts/
+// Create variables with empty default values
+ext["ossrhUsername"] = ''
+ext["ossrhPassword"] = ''
+ext["sonatypeStagingProfileId"] = ''
+ext["signing.keyId"] = ''
+ext["signing.password"] = ''
+ext["signing.secretKeyRingFile"] = ''
+
+File secretPropsFile = project.rootProject.file('local.properties')
+if (secretPropsFile.exists()) {
+    // Read local.properties file first if it exists
+    Properties p = new Properties()
+    new FileInputStream(secretPropsFile).withCloseable { is -> p.load(is) }
+    p.each { name, value -> ext[name] = value }
+}
+// Use system environment variables
+ext["ossrhUsername"] = System.getenv('OSSRH_USERNAME') ?: ext["ossrhUsername"]
+ext["ossrhPassword"] = System.getenv('OSSRH_PASSWORD') ?: ext["ossrhPassword"]
+ext["sonatypeStagingProfileId"] = System.getenv('SONATYPE_STAGING_PROFILE_ID') ?: ext["sonatypeStagingProfileId"]
+ext["signing.keyId"] = System.getenv('SIGNING_KEY_ID') ?: ext["signing.keyId"]
+ext["signing.password"] = System.getenv('SIGNING_PASSWORD') ?: ext["signing.password"]
+ext["signing.secretKeyRingFile"] = System.getenv('SIGNING_SECRET_KEY_RING_FILE') ?: ext["signing.secretKeyRingFile"]
+
+/*
+// Set up Sonatype repository
+nexusPublishing {
+    repositories {
+        sonatype {
+            nexusUrl.set(uri("https://s01.oss.sonatype.org/service/local/"))
+            snapshotRepositoryUrl.set(uri("https://s01.oss.sonatype.org/content/repositories/snapshots/"))
+            stagingProfileId = sonatypeStagingProfileId
+            username = ossrhUsername
+            password = ossrhPassword
+        }
+    }
+}
+*/