publish-root.gradle

// Create variables with empty default values
ext["signing.keyId"] = ''
ext["signing.password"] = ''
ext["signing.key"] = ''
ext["ossrhUsername"] = ''
ext["ossrhPassword"] = ''
ext["sonatypeStagingProfileId"] = ''

Properties p = new Properties()
def localPropertiesFile = file("local.properties")
// Read local.properties file if it exists
if (localPropertiesFile.exists()) {
    p.load(localPropertiesFile.newInputStream())
}
p.each { name, value -> ext[name] = value }

// Set up Sonatype repository
nexusPublishing {
    repositories {
        sonatype {
            stagingProfileId = sonatypeStagingProfileId
            username = ossrhUsername
            password = ossrhPassword
            nexusUrl.set(uri("https://ossrh-staging-api.central.sonatype.com/service/local/"))
            snapshotRepositoryUrl.set(uri("https://ossrh-staging-api.central.sonatype.com/content/repositories/snapshots/"))
        }
    }
}