Update Jenkinsfile

Jenkinsfile

@@ -1,7 +1,8 @@
 /* groovylint-disable-next-line UnusedVariable */
 @Library('InnoHub-Library') _
 
-Boolean didRun = false
+def didRun = false
+def versionTag = 'null'
 
 pipeline {
     agent any
@@ -11,7 +12,6 @@ pipeline {
     }
 
     environment {
-        VERSION_TAG = 'null'
         REGISTRY = 'https://gitea.innovation-hub-niedersachsen.de/'
         USER = 'jenkins'
         TOKEN = credentials('JenkinsGitea')
@@ -35,8 +35,8 @@ pipeline {
         stage('Set Version Tag') {
             steps {
                 script {
-                    env.VERSION_TAG = generateVersionTag(params.GIT_REF)
-                    echo "[INFO] Using VERSION_TAG: ${env.VERSION_TAG}"
+                    versionTag = generateVersionTag(params.GIT_REF)
+                    echo "[INFO] Using VERSION_TAG: ${versionTag}"
                 }
             }
         }        
@@ -84,7 +84,7 @@ pipeline {
                     def imageName = "gitea.innovation-hub-niedersachsen.de/innohub/tatort-dev"
 
                     docker.withRegistry(REGISTRY, 'JenkinsGitea') {
-                        def img = docker.build("${imageName}:${env.VERSION_TAG}", '-f Dockerfile.dev .')
+                        def img = docker.build("${imageName}:${versionTag}", '-f Dockerfile.dev .')
                         img.push()
                         img.push('latest')
                     }
@@ -101,7 +101,7 @@ pipeline {
             steps {
                 script {
                     updateHelmChart([
-                        tag: env.VERSION_TAG,
+                        tag: versionTag,
                         repoUrl: 'gitea.innovation-hub-niedersachsen.de/innohub/charts.git',
                         chartPath: 'tatort-dev/tatort',
                         chartName: 'tatort',