Use CI ssh key

CONTRIBUTING.md

@@ -79,8 +79,8 @@ use it. This is a manual process for now. Follow these steps:
 1. Create a new VPS
    ```
    export HOST_NAME=baseimage$(date +'%Y%m%d')
-   # Make sure you use your private ssh key id
-   export SSH_ID=112
+   # Make sure you use your private ssh key id, 411 is the ssh key used in CI
+   export SSH_ID=411
    python -m openappstack ${HOST_NAME} create --create-droplet --create-hostname ${HOST_NAME}.openappstack.net --ssh-key-id $SSH_ID --create-domain-records --subdomain ${HOST_NAME} openappstack.net
    ```