Add support for specifying env variables
Add support for specifying env variables

Signed-off-by: Mrunal Patel <d389837b018b67489df74a2c5f0aca13aaed44b6@gmail.com>

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