publish-root.gradle

// Create variables with empty default values
ext["signing.keyId"] = System.getenv('SIGNING_KEYID') ?: project.properties['SIGNING_KEYID']
ext["signing.password"] = System.getenv('SIGNING_PASSWORD') ?: project.properties['SIGNING_PASSWORD']
ext["signing.secretKeyRingFile"] = System.getenv('SIGNING_SECRET_KEY_RING_FILE') ?: project.properties['SIGNING_SECRET_KEY_RING_FILE']
ext["ossrhUsername"] = System.getenv('OSSRH_USERNAME') ?: project.properties['OSSRH_USERNAME']
ext["ossrhPassword"] = System.getenv('OSSRH_PASSWORD') ?: project.properties['OSSRH_PASSWORD']
ext["sonatypeStagingProfileId"] = System.getenv('SONATYPE_STAGING_PROFILE_ID') ?: project.properties['SONATYPE_STAGING_PROFILE_ID']

// Set up Sonatype repository
nexusPublishing {
    repositories {
        sonatype {
            stagingProfileId = sonatypeStagingProfileId
            username = ossrhUsername
            password = ossrhPassword

            nexusUrl.set(uri("https://s01.oss.sonatype.org/service/local/"))
            snapshotRepositoryUrl.set(uri("https://s01.oss.sonatype.org/content/repositories/snapshots/"))
        }
    }
}