Podman support

[sultetveny]

What steps did you take and what happened:

sonobuoy images list

INFO[0000] e2e image to be used: registry.k8s.io/conformance:v1.27.16 
INFO[0000] Pulling image: registry.k8s.io/conformance:v1.27.16 ... 
ERRO[0001] failed with following error after 1 retries: 
ERRO[0001] unable to collect images of plugins: failed to gather test images from e2e image: exec: "docker": executable file not found in $PATH 

It tries to find docker binary unsuccessfully, but we use podman instead.

What did you expect to happen:

sonobuoy images list

INFO[0000] e2e image to be used: registry.k8s.io/conformance:v1.27.16 
INFO[0000] Pulling image: registry.k8s.io/conformance:v1.27.16 ... 
gcr.io/authenticated-image-pulling/alpine:3.7
gcr.io/authenticated-image-pulling/windows-nanoserver:v1
gcr.io/k8s-authenticated-test/agnhost:2.6
...

Anything else you would like to add:

A workaround is to create a symlink from podman to docker.

ln -s /usr/bin/podman /usr/bin/docker

It could be much better if sonobuoy can support this without such configuration. Using additional flag/option for the cli, or detecting automatically which binary is available on the host.

Environment:

• Sonobuoy version: v0.57.2
• Kubernetes version: v1.27.16
• Cloud provider or hardware configuration: OpenStack
• OS (e.g. from /etc/os-release): Red Hat Enterprise Linux 8.10 (Ootpa)