List volumes before pruning

[iwita]

This commit lists the volumes that are going to be removed when the command podman volume prune is issued.
It is applied only in the cases when --force flag is not enabled.
Closes #8913

[rhatdan]

You are going to need to add some kind of tests.

Also could you squash your commits.

[TomSweeneyRedHat]

Any man page tweaks needed?

[iwita]

Any man page tweaks needed?

There is an additional flag unused=0/1 added.

[rhatdan]

LGTM

[rhatdan]

@containers/podman-maintainers PTAL

[rhatdan]

This should go in Post 3.0 release.

[iwita]

Just thought that I should use the already defined filter dangling instead of creating a new one. Thus, I will update this PR.

[TomSweeneyRedHat]

LGTM
should this be cherry-picked to the release-3.0 branch?

[rhatdan]

No we want this in podman 3.1
/lgtm
/approve
Thanks @iwita
Nice work.

[openshift-ci-robot]

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[iwita]

No we want this in podman 3.1
/lgtm
/approve
Thanks @iwita
Nice work.

@rhatdan thank you for your guidance.

[rhatdan]

Now we expect you do fix some other issues, if you want. Look for good first issues.

[iwita]

Now we expect you do fix some other issues, if you want. Look for good first issues.

@rhatdan Yes of course. I will check good first issues in order to find something that I could help with!