feat(outscale): Add Flatcar and NVIDIA GPU support

[hajowieland]

Change description

This change adds support for Flatcar Linux on Outscale with optional NVIDIA GPU support (via sysext).

• Is this change including a new Provider or a new OS? (y/n) n
• If yes, has the Provider/OS matrix been updated in the readme? (y/n) y
• If adding a new provider, are you a representative of that provider? (y/n) n

Additional context

The change was tested with GPU and without. Also the Cluster API Provider Outscale needs to be updated to support Ignition.

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[mboersma]

/ok-to-test

[drew-viles]

Pending the JSON sort, lgtm

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[drew-viles]

/retest

[mboersma]

/retest

[mboersma]

The docs say here "Defaults to stable" but I don't see a default set anywhere, just the user var in packer-flatcar.json. Same for FLATCAR_VERSION.

Could you set a safe default in install-flatcar.sh itself?

FLATCAR_CHANNEL="${FLATCAR_CHANNEL:-stable}"
FLATCAR_VERSION="${FLATCAR_VERSION:-current}"

or change the documentation so it doesn't imply there's a default.