fix: conditionally load image to kind
This should allow us to fetch images from a registry during the
matrix builds.
set -e
echo "Upload image to KinD"
-kind load docker-image "${IMG}" --name chart-testing
-kind load docker-image "${SETUPTOOLS_IMG}" --name chart-testing
+[[ -n "${IMG}" ]] && kind load docker-image "${IMG}" --name chart-testing
+[[ -n "${SETUPTOOLS_IMG}" ]] && kind load docker-image "${SETUPTOOLS_IMG}" --name chart-testing
echo "Init redskyops"
dist/redskyctl_linux_amd64/redskyctl init --wait
echo "Create postgres experiment"
