Fix typo

.gitlab-ci.yml

@@ -28,7 +28,7 @@ pytest:
     #  Our self-hosted runners have persistent home directories, so here we store
     #  the known_hosts file in the temporary project dir and tell git to use a ssh
     #  command that uses this hosts file during operations
-    - export GIT_SSH_COMMAND="ssh UserKnownHostsFile=$CI_PROJECT_DIR/.ssh/known_hosts"
+    - export GIT_SSH_COMMAND="ssh -o UserKnownHostsFile=$CI_PROJECT_DIR/.ssh/known_hosts"
     - mkdir -p $CI_PROJECT_DIR/.ssh
     - chmod 700 $CI_PROJECT_DIR/.ssh
     - ssh-keyscan -p 10022 git.xfel.eu > $CI_PROJECT_DIR/.ssh/known_hosts