In ".gitlab-ci-templates.yml", use option "-i" for "scp" command.

.gitlab-ci-templates.yml

@@ -58,5 +58,5 @@
     script:
         - mvn clean
         - mvn -Dmaven.test.skip=true package
-        - scp -v VadereSimulator/target/vadere-console.jar di49mur@webdev-mwn.lrz.de:~/webserver/htdocs/builds/vadere_latest.jar
+        - scp -v -i ~/.ssh/id_rsa VadereSimulator/target/vadere-console.jar di49mur@webdev-mwn.lrz.de:~/webserver/htdocs/builds/vadere_latest.jar