wa-linux-agent: Fix overriding SSH public key from Ignition config

[dongsupark]

Recently a bug in wa-linux-agent was found, which happened when overriding the SSH public key provided by Ignition configuration during provisioning. It was not a critical bug, because that override happens only under limited circumstances.

A fix PR by @peytonr18 was already merged.

It is still necessary to pull in the fix into flatcar/scripts repo. Since then there is no new release of wa-linux-agent yet, so it is necessary to pick up the fix as a separate patch.

Current wa-linux-agent version of Flatcar is still 2.9.1.1, while upstream has a newer version 2.12.0.4. So in case of main (future Alpha), it might be better to bump the version and apply the patch.

In case of other channels, it would be better to simply apply the patch without updating version.

[tormath1]

So in case of Alpha, it might be better to bump the version and apply the patch.

There is a PR for main but not for alpha. When we will promote alpha to beta at next release we won't get the fix, so we might need to backport this: flatcar/scripts#2696 to alpha as well?

[dongsupark]

Oh, I meant main for sure. Let me edit. Thanks.

[tormath1]

Good but it still has to be backported to current alpha (flatcar-4230) in case we promote this branch to beta at next release.