Use the correct binary for unpacking the preload

[afbjorklund]

Previously hardcoded to always use a Docker volume,
even if using a different container driver (podman).

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: afbjorklund

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[codecov-io]

Codecov Report

Merging #7961 into master will increase coverage by 0.35%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #7961      +/-   ##
==========================================
+ Coverage   35.71%   36.07%   +0.35%     
==========================================
  Files         149      144       -5     
  Lines        9408     9190     -218     
==========================================
- Hits         3360     3315      -45     
+ Misses       5644     5474     -170     
+ Partials      404      401       -3     

Impacted Files	Coverage Δ
cmd/minikube/cmd/tunnel.go	5.26% <100.00%> (+0.13%)	⬆️
pkg/minikube/download/progressbar.go

[tstromberg]

/ok-to-test

[minikube-pr-bot]

kvm2 Driver
docker Driver

[afbjorklund]

@medyagh This failed when SELinux was enable on the host.
The mounted file was not properly accessible to the container:

tar (child): /preloaded.tar: Cannot open: Permission denied
-?????????? ? ? ? ? ? preloaded.tar

So it also needs some kind of context added, to the mount.
That is, there needs to be a :Z appended, when getenforce...

https://github.com/containers/libpod/blob/master/troubleshooting.md#2-cant-use-volume-mount-get-permission-denied

Still missing Fedora machines in CI