manifests: include kubernetes.yaml

[jbtrystram]

FCOS had shipped ZRAM-generator for a while but it was not shared with RHCOS. Moved the package to a different sub-manifest that would regroup kubernetes-specific things.
The swap on ZRAM would still need to be actually enabled through a config file [1] but that should be done by the MCO.

[1] https://github.com/systemd/zram-generator/blob/main/man/zram-generator.conf.md

ref: coreos/fedora-coreos-config#2937
ref: https://issues.redhat.com/browse/COS-2507

[openshift-merge-robot]

PR needs rebase.

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[jbtrystram]

/hold

[openshift-ci]

@jbtrystram: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/rhcos-9-build-test-metal	9c01152	link	true	/test rhcos-9-build-test-metal
ci/prow/images	9c01152	link	true	/test images
ci/prow/scos-9-build-test-metal	9c01152	link	true	/test scos-9-build-test-metal
ci/prow/rhcos-9-build-test-qemu	9c01152	link	true	/test rhcos-9-build-test-qemu
ci/prow/scos-9-build-test-qemu	9c01152	link	true	/test scos-9-build-test-qemu
ci/prow/validate	9c01152	link	true	/test validate

Full PR test history. Your PR dashboard.

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[openshift-ci]

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[dustymabe]

I'm thinking there is a better way: coreos/fedora-coreos-config#2937 (comment)