Buddy Works Craft 3 post-deployment atomic deployment action

post-deploy.md

if [ -d "releases/${execution.to_revision.revision}" ] && [ "${execution.refresh}" = "true" ]; then echo "Removing: releases/${execution.to_revision.revision}" && rm -rf releases/${execution.to_revision.revision}; fi
if [ ! -d "releases/${execution.to_revision.revision}" ]; then echo "Creating: releases/${execution.to_revision.revision}" && cp -dR deploy-cache releases/${execution.to_revision.revision}; fi
echo "Creating: persistence directories"
mkdir -p storage/craft
mkdir -p storage/cpresources
mkdir -p storage/uploads
echo "Symlinking: persistence directories"
ln -nfs ~/path/to/app/storage/craft ~/path/to/app/releases/${execution.to_revision.revision}/storage
ln -nfs ~/path/to/app/storage/cpresources ~/path/to/app/releases/${execution.to_revision.revision}/web/cpresources
ln -nfs ~/apps/clydecocampaigns/storage/uploads ~/apps/clydecocampaigns/releases/${execution.to_revision.revision}/web/uploads
echo "Linking current to revision: ${execution.to_revision.revision}"
rm -f current
ln -s releases/${execution.to_revision.revision} current
echo "Removing old releases"
cd releases && ls -t | tail -n +4 | xargs rm -rf

What do you do here?
ln -nfs ~/path/to/app/storage/craft ~/path/to/app/releases/${execution.to_revision.revision}/storage whats inside the craft folder?
We talk about craft3?