Add ssh-keyscan. Start ssh-agent for cargo.

limbo/limbo-just-build.yaml

@@ -15,6 +15,7 @@ spec:
       cp -r $(workspaces.ssh-directory.path) ~/.ssh
       chmod 700 ~/.ssh
       chmod -R 400 ~/.ssh/*
+      eval $(ssh-agent -s)
       ssh-keyscan -H -p 2222 git.jpace121.net >> ~/.ssh/known_hosts
       # Use just to run the ci steps.
       source ~/.cargo/env