Further update.

Jenkinsfile

@@ -53,7 +53,10 @@ pipeline {
           sshagent(credentials: ['kieker-irl-key']) {
              sh 'sftp -oNoHostAuthenticationForLocalhost=yes -oStrictHostKeyChecking=no -oUser=repo  -F /dev/null -i ${KEYSTORE} ${UPDATE_SITE_URL}'
              sh '${BASE_DIR}/compile-results/bin/compile-results "${BASE_DIR}/results-kieker/results-text.csv" "${BASE_DIR}/all-results.json"'
-             sh 'echo put all-results.json |sftp -oNoHostAuthenticationForLocalhost=yes -oStrictHostKeyChecking=no -oUser=repo  -F /dev/null -i ${KEYSTORE} ${UPDATE_SITE_URL}/all-results.json'
+             sh '''
+                 cd ${BASE_DIR}
+                 echo "put all-results.json" | sftp -oNoHostAuthenticationForLocalhost=yes -oStrictHostKeyChecking=no -oUser=repo  -F /dev/null -i ${KEYSTORE} ${UPDATE_SITE_URL}
+                '''
           }
        }
        post {