add snyk test

Jenkinsfile

@@ -31,7 +31,7 @@ node {
     stage('Snyk Test') {
         /* This stage runs Snyk to test the image for vulnerabilities.
          * Make sure you have the Snyk plugin installed in Jenkins. */
-        snykSecurity test: 'hochzeit:latest', failOnError: true, failOnIssues: true, snykInstallation: 'snyk'
+        snykSecurity test: 'hochzeit:latest', failOnError: true, failOnIssues: true, snykInstallation: 'snyk@latest'
     }
 
     stage('Push image') {