Fix publishing after the update to Gradle 8

build-logic/src/main/kotlin/dokkabuild.publish-base.gradle.kts

@@ -82,3 +82,14 @@ signing {
     sign(publishing.publications)
     setRequired(provider { !project.version.toString().endsWith("-SNAPSHOT") })
 }
+
+// This is a hack for a Gradle 8 problem, see https://github.com/gradle/gradle/issues/26091
+//
+// Fails with the following error otherwise:
+// > Task ':runner-gradle-classic:publishDokkaPluginMarkerMavenPublicationToSpaceTestRepository' uses
+// > this output of task ':runner-gradle-classic:signPluginMavenPublication' without declaring an
+// > explicit or implicit dependency.
+tasks.withType<AbstractPublishToMaven>().configureEach {
+    val signingTasks = tasks.withType<Sign>()
+    mustRunAfter(signingTasks)
+}