Add step for ssh keys

Ref: https://docs.gitlab.com/ee/ci/ssh_keys/

.gitlab-ci.yml

@@ -144,6 +144,9 @@ test:
   script:
     - FAILED=false
     - chmod 400 "$SSH_PRIV_KEY"
+    - ssh-add "$SSH_PRIV_KEY"
+    - mkdir ~/.ssh
+    - chmod 700 ~/.ssh
     - OLD_INSTANCE_IP=$(openstack floating ip list --floating-ip-address $CHEAHA_IP -c "Fixed IP Address" -f value)
     - echo $OLD_INSTANCE_IP
     - |