stop referencing machine-os-content

[cgwalters]

AIUI current OKD is using machine-os-content as a way to find "the default OS image" - it's making it be a new format image.

I guess actually we could just do that for OCP/RHCOS too, i.e. do a hard cutover and just ship rhel-coreos-8 as a retagging. I'm not opposed to that. But it feels better to make a "clean cut" and have a new image in the new format, and crucially define a better way to find "the default OS image". Which could just be another new tag...like default-operating-system or something.

Anyways the bootstrap phase currently does

MACHINE_CONFIG_OSCONTENT=$(image_for machine-os-content)

and this will eventually break if we do openshift/machine-config-operator#3364

[LorbusChris]

The fix for this is included in openshift/installer#6443, particularly openshift/installer@55bbb10

[LorbusChris]

@cgwalters not sure you're aware, we just got this from our latest OKD/SCOS CI release try:

operator "driver-toolkit" contained an invalid image-references file: no input image tag named "machine-os-content"

[LorbusChris]

Ah, that's openshift/driver-toolkit#102

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/lifecycle stale

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[openshift-ci]

@openshift-bot: Closing this issue.

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