OZG-6368 No Bash syntax in Groovy allowed

alfa-client/Jenkinsfile.e2e

@@ -621,14 +621,14 @@ Void publishAdminE2ETestResult() {
 }
 
 Void publishE2ETestResult(String appName, String appVariant, String reportName) {
-  def reportDir = "alfa-client/apps/${appName}/reports/${appVariant}";
+  def reportDir = "alfa-client/apps/"+appName+"/reports/"+appVariant;
 
   publishHTML (
     target: [
       allowMissing: false,
       alwaysLinkToLastBuild: false,
       keepAll: true,
-      reportDir: ${reportDir},
+      reportDir: reportDir,
       reportFiles: 'report.html',
       reportName: reportName
     ]