Add support for using podman with docker-env

[afbjorklund]

Here is support for connecting to the podman socket.

The "podman-env" command should be deprecated...

$ eval $(./out/minikube docker-env)
Identity added: /home/anders/.minikube/machines/minikube/id_rsa (/home/anders/.minikube/machines/minikube/id_rsa)
$ docker version
Client:
 Version:           24.0.7
 API version:       1.40 (downgraded from 1.43)
 Go version:        go1.21.1
 Git commit:        24.0.7-0ubuntu2~20.04.1
 Built:             Wed Mar 13 20:29:24 2024
 OS/Arch:           linux/amd64
 Context:           default

Server: linux/amd64/ubuntu-22.04
 Podman Engine:
  Version:          3.4.4
  APIVersion:       3.4.4
  Arch:             amd64
  BuildTime:        1970-01-01T00:00:00Z
  Experimental:     false
  GitCommit:        
  GoVersion:        go1.18.1
  KernelVersion:    5.4.0-204-generic
  MinAPIVersion:    3.1.0
  Os:               linux
 Conmon:
  Version:          conmon version 2.1.2, commit: 
  Package:          conmon: /usr/libexec/podman/conmon
 OCI Runtime (crun):
  Version:          crun version UNKNOWN
commit: ea1fe3938eefa14eb707f1d22adff4db670645d6
spec: 1.0.0
+SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +CRIU +YAJL
  Package:          crun: /usr/bin/crun
 Engine:
  Version:          3.4.4
  API version:      1.40 (minimum version 1.24)
  Go version:       go1.18.1
  Git commit:       
  Built:            Thu Jan  1 00:00:00 1970
  OS/Arch:          linux/amd64
  Experimental:     false

[k8s-ci-robot]

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This pull-request has been approved by: afbjorklund
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