allow for podman to be used for running tests

[kannon92]

Fixes #332

This allows one to substitute podman over docker.

[kannon92]

I think there may be an issue with subbing podman for docker due to some missing commands in podman. This PR should allow for running tests but we require docker in some places.

[kannon92]

@danielvegamyhre wdyt about this PR?

Podman has over 12k stars so it seems to be well used. On fedora, it is the default container engine so it would be nice to not require docker.

Kind also has some support for podman.

[danielvegamyhre]

Looks good to me! Did you manually test that the defaulting to docker works?

[kannon92]

Looks good to me! Did you manually test that the defaulting to docker works?

Yea, I tested both cases.

[danielvegamyhre]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: danielvegamyhre, kannon92

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[kannon92]

@danielvegamyhre when you get a chance, can you give a lgtm also?

[danielvegamyhre]

/lgtm