Make signing optional

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 - MPP does not use JVM and JS(IR) targets anymore. They could be turned manually via `js()`, `jvm()` or `fullStack()`
+- Signing is not applied if signingId is not provided
 
 ### Deprecated
 

src/main/kotlin/space/kscience/gradle/internal/publishing.kt

@@ -89,6 +89,7 @@ internal fun Project.setupPublication(mavenPomConfiguration: MavenPom.() -> Unit
                 }
             }
 
+            if (requestPropertyOrNull("publishing.signing.id") != null || requestPropertyOrNull("signing.gnupg.keyName") != null) {
 
                 if (!plugins.hasPlugin("signing")) {
                     apply<SigningPlugin>()
@@ -102,9 +103,12 @@ internal fun Project.setupPublication(mavenPomConfiguration: MavenPom.() -> Unit
 
                         // if key is provided, use it
                         useInMemoryPgpKeys(signingId, signingKey, signingPassphrase)
-                } // else use file signing
+                    } // else use agent signing
                     sign(publications)
                 }
+            } else {
+                logger.warn("Signing information is not provided. Skipping artefact signing.")
+            }
         }
     }
 }