OZG-2651 add missing env variable

Jenkinsfile

@@ -80,6 +80,8 @@ pipeline {
                     def pom = readMavenPom file: 'pom.xml'
                     def version = pom.version
                     
+                    QUARKUS_CONTAINER_IMAGE_TAG = "${env.BRANCH_NAME}-${version}"
+
                     container("quarkus-22") {
                         withCredentials([usernamePassword(credentialsId: 'jenkins-docker-login', usernameVariable: 'USER', passwordVariable: 'PASSWORD')]) {
                             sh 'podman login docker.ozg-sh.de -u ${USER} -p ${PASSWORD}'