Makefile: allow building using Podman

[mykaul]

These patches to the Makefile files allow building with Podman as an alternative to Docker.

Signed-off-by: Yaniv Kaul [email protected]

[stale[bot]]

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[mykaul]

unstale please

[guits]

@dsavineau can we get this one merged? is there anything else needed?

[ktdreyer]

I just switched over to podman entirely in https://github.com/ceph/ceph-container/pull/2011