16. fix use ssh in ci script

.gitlab-ci.yml

@@ -51,6 +51,17 @@ job3:
         variables:
                 GIT_SUBMODULE_STRATEGY: recursive
 
+        before_script:
+                - echo "Prepare ssh environment"
+                - eval $(ssh-agent -s)
+                - echo "$SSH_PRIVATE_KEY" | tr -d '\r' | ssh-add -
+                - mkdir -p ~/.ssh
+                - chmod 700 ~/.ssh
+                - ssh-keyscan gitlab.com >> ~/.ssh/known_hosts
+                - chmod 644 ~/.ssh/known_hosts
+                - ssh git@gitlab.com
+                - echo "Preparing ssh environment done"
+                - whoami
 
         script:
                 - whoami