jailer: fix regex mountpoint detection
jailer: fix regex mountpoint detection

Signed-off-by: hatf0 <75f1ed51a9625177afa96587ef1f3137fe38c5a3@0xcc.pw>

firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker