[CI:DOCS] Add information on how podman machine is updated

[ashley-cui]

Update documentation on how the default podman machine distribution,
FCOS, is updated.

[CI:DOCS]

Signed-off-by: Ashley Cui [email protected]

Fixes: #11680

What this PR does / why we need it:

How to verify it

Which issue(s) this PR fixes:

Special notes for your reviewer:

[ashley-cui]

@afbjorklund PTAL, let me know if any information is missing that should be included.

cc @baude

[rhatdan]

I definitely think this should be controlled by the user. Having all of your apps disappear because FCOS decides it is time to reboot is not a good experience.

[ashley-cui]

I definitely think this should be controlled by the user. Having all of your apps disappear because FCOS decides it is time to reboot is not a good experience.

Yeah, I agree with this, probably a flag within podman machine init that allows for setting how the update reboot is done.

[TomSweeneyRedHat]

LGTM
would like a head nod from @afbjorklund

[afbjorklund]

It looks good, although I'm not sure I would link to a specific stream of Fedora CoreOS (since it might change later?)

https://getfedora.org/en/coreos?stream=testing

It is of course true for now (at least for 3.4), so can update the documentation later if and when the default changes ?

Software updates generally follow the next → testing → stable flow

[rhatdan]

/approve
/lgtm
I agree we will have to change when we change the defaults.

[openshift-ci]

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