👷 Add jenkins tagger

Jenkinsfile

@@ -2,7 +2,22 @@ pipeline {
     agent any
 
     stages {
+        stage('Tag git commit') {
+            steps {
+                script {
+                    sshagent(['jenkins']) {
+                        sh """
+                            git config user.email "jenkins"
+                            git config user.name "jenkins@dinauer-paf.de"
 
+                            git tag -a build-${env.BUILD_NUMBER} -m "Jenkins Build ${env.BUILD_NUMBER}"
+
+                            git push origin build-${env.BUILD_NUMBER}
+                        """
+                    }
+                }
+            }
+        }
         stage('Set Image Name') {
             steps {
                 script {