apt-get install 'rsync'

mkdir --parents ~/.ssh
echo '${{secrets.cd}}' > ~/.ssh/id_ed25519
chmod 400 ~/.ssh/id_ed25519

ssh \
-o StrictHostKeyChecking=accept-new \
'cd@de.tilde.link' -- hostname

rsync \
--archive \
--delete-before \
--verbose \
'out/' \
"cd@de.tilde.link:/cd/${GITHUB_REF_NAME}/${GITHUB_REPOSITORY}/"