Adding eval ssh-agent -s because it is required and I didn't think it was

Signed-off-by: Louis Vallat <louis@louis-vallat.xyz>

.gitlab-ci.yml

@@ -80,6 +80,7 @@ release-master:
 deploy:
   stage: deploy
   before_script:
+    - eval $(ssh-agent -s)
     - echo "$SSH_PRIVATE_KEY" | tr -d '\r' | ssh-add -
     - mkdir -p ~/.ssh
     - chmod 700 ~/.ssh