fix build without giteaToken defined

build.gradle

@@ -36,7 +36,8 @@ tasks.named('test') {
     useJUnitPlatform()
 }
 
-publishing {
+if (project.hasProperty('giteaToken') && project.giteaToken) {
+    publishing {
         publications {
             mavenJava(MavenPublication) {
                 from components.java
@@ -57,6 +58,9 @@ publishing {
                 }
             }
         }
+    }
+} else {
+    println "No giteaToken defined - skipping publishing configuration"
 }
 
 gradle.taskGraph.whenReady { taskGraph ->