set version from tag manually

build.gradle

@@ -37,7 +37,12 @@ buildscript {
 // TODO: remove this hack once jgit supports worktrees and nebula upgrades.
 if (project.hasProperty('antora')) {
     'git fetch --unshallow --all --tags'.execute().text // antora shallow-clones so there is no history
+    String tag = 'git tag --points-at HEAD'.execute().text.trim() // jgit does not able to figure out tags in antora's setup
+    if (tag) { ext['release.version'] = tag }
     ext['git.root'] = 'git rev-parse --path-format=absolute --git-common-dir'.execute().text.trim()
+    println '------------'
+    println "${tag}"
+    println '------------'
 }
 
 // TODO: remove this hack, see: https://github.com/nebula-plugins/nebula-release-plugin/issues/213