Jenkinsfile hugo cache dir needs to be absolute

+ hugo --verbose --cacheDir=./hugo_cache
Error: failed to create file caches from configuration:
"hugo_cache/.matetelki.eu_properhorse_master"
must resolve to an absolute directory

Jenkinsfile

@@ -4,7 +4,7 @@ pipeline {
 	stages {
 		stage('Generate page with Hugo') {
 			steps {
-				sh 'hugo --verbose --cacheDir=./hugo_cache'
+				sh 'hugo --verbose --cacheDir=${WORKSPACE}/hugo_cache'
 				archiveArtifacts artifacts: 'public/**/*.*', fingerprint: true
 			}
 		}