build: enclose shell variables in `{}`
build: enclose shell variables in `{}`

enclose the shell variables in `{}` deploy.sh

Signed-off-by: Madhu Rajanna <60fbf37a92c2a0908e31296d18dadbec5a4dae17@gmail.com>

ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi