runtimetest: add readonly path validation
runtimetest: add readonly path validation

Signed-off-by: Ma Shimiao <4511f16e942ad3568742865d09c9060c1d8bebb9@cn.fujitsu.com>

liangchenye/ocitools,opencontainers/runtime-tools,opencontainers/ocitools,liangchenye/ocitools,wking/ocitools-v2,hmeng-19/ocitools,opencontainers/runtime-tools,wking/ocitools-v2,opencontainers/ocitools,hmeng-19/ocitools