Fix publishing to Sonatype #3

Author: ileasile

kotlin-jupyter-publish/src/main/kotlin/org/jetbrains/kotlinx/jupyter/publishing/publication.kt

@@ -68,7 +68,7 @@ fun Project.addPublication(configuration: ArtifactPublication.() -> Unit) {
 
                 if (privateKeyFile.exists() || publicKeyFile.exists()) return@doLast
 
-                println("Private: $signingPrivateKey\n\nPublic: $signingKey")
+                println("Private len: ${signingPrivateKey.length}\n\nPublic: $signingKey")
 
                 privateKeyFile.writeText(signingPrivateKey)
                 publicKeyFile.writeText(signingKey)