Add integration test with podman

[snprajwal]

Currently, we only run tests with BATS. This does not let us test changes in real world scenarios with containers. An integration test where a container is checkpointed and then the archive used for testing is much more robust and bulletproof.

[rst0git]

It might be good to have integration tests with both CRI-O and Podman.

[snprajwal]

One clarification for this - since the podman test I'm writing uses looper and the existing test uses piggie, would it make sense to have two separate BATS file for each of these tests? If the output differs, we can change it accordingly in the relevant file. Currently, the same test file works for both checkpoints, but I don't think that will stay the same as we add more features/ tests in the future.

[snprajwal]

One clarification for this - since the podman test I'm writing uses looper and the existing test uses piggie, would it make sense to have two separate BATS file for each of these tests? If the output differs, we can change it accordingly in the relevant file. Currently, the same test file works for both checkpoints, but I don't think that will stay the same as we add more features/ tests in the future.

@rst0git @adrianreber what do you think of this?