Add --volume-mode flag for container/pod creation

[ygalblum]

Add a new --volume-mode flag that controls behavior when a named volume doesn't exist during container or pod creation.

Supported modes:

• create (default): auto-create missing named volumes
• fail: return an error if the volume doesn't exist

The flag is available on: podman create, podman run, podman pod create, and podman pod clone.

See: #27862

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Does this PR introduce a user-facing change?

volume-mode: New command line argument for run, create and pod create to instruct podman to fail when a named volume does not exist instead of creating one.

[Luap99]

Do we really want a new cli option for this? Would it not be bvetter to pass this on a per volume basis as volume option? --volume name:/dest:nocreate or something like this.

[Luap99]

error messages in the backend logic like here should not refer to the cli names, we might be called via rest API, etc.. where these names don't make sense

[ygalblum]

Do we really want a new cli option for this? Would it not be better to pass this on a per volume basis as volume option? --volume name:/dest:nocreate or something like this.

@mheon and I discussed this question and we also weren't sure if this should be global or volume specific. I don't mind changing it if you think that would be better.

[packit-as-a-service]

[NON-BLOCKING] Packit jobs failed. @containers/packit-build please check. Everyone else, feel free to ignore.

[Luap99]

Do we really want a new cli option for this? Would it not be better to pass this on a per volume basis as volume option? --volume name:/dest:nocreate or something like this.

@mheon and I discussed this question and we also weren't sure if this should be global or volume specific. I don't mind changing it if you think that would be better.

I don't care to strongly either way, --volume-mode as name doesn't sound to easy to grasp what it is about to me. i.e. we have something somewhat related with --image-volume. But I cannot offer a better name so I guess --volume-mode is the best choice we have.