Add mmap cache option to QEMU mount

[bc-lee]

This is required for mmap'ing on mounted files on MacOS Host. Closes #19639, #20055.

Does this PR introduce a user-facing change?

podman-machine: MacOS: Mount volumes with mmap enabled

[rhatdan]

LGTM
@gbraad @baude @slp WDYT?

[cgwalters]

I hit the problem described here when using devcontainers; at least cargo/rustc use mmap to access some bits in the build process.

I've verified this PR fixes the problem.

[cgwalters]

/approve
/lgtm

[baude]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: baude, bc-lee, cgwalters

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[baude]

are there implications for linux and qemu ? also, it should be noted that qemu will be deprecated on mac in podman 5 in favor of the apple hypervisor

[bc-lee]

are there implications for linux and qemu ?

If someone uses Podman on Linux with QEMU, then they are also affected by this PR, for the same reasons.

also, it should be noted that qemu will be deprecated on mac in podman 5 in favor of the apple hypervisor

I didn't know that. Thanks for the info. FYI, I have some machines/users that still use Podman with Amd64 macOS machines, so I hope that Podman will continue to support QEMU implementation for a while.