podman: Add ptest support for system tests

The recipe was proposed for meta-virtualization kirkstone[1] but it
might not be deemed resonable[2] for a stable branch.

[1] https://lists.yoctoproject.org/g/meta-virtualization/message/7598
[2] https://lists.yoctoproject.org/g/meta-virtualization/message/7603

Fixes: eclipse/oniro-core/oniro#21



Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>