Upgrade Linux Firmware in main from 20260519 to 20260622

[flatcar-infra]

Subject says it all.

[Copilot]

Pull request overview

Updates the Gentoo overlay packaging for linux-firmware used in the SDK container by bumping the referenced firmware snapshot from 20260519 to 20260622, adding a corresponding versioned ebuild and documenting the update in the changelog.

Changes:

• Updated the coreos-firmware Manifest distfile entry to linux-firmware-20260622.tar.xz with new size and hashes.
• Added coreos-firmware-20260622.ebuild to package the new firmware snapshot.
• Added a changelog entry referencing the upstream 20260622 tag.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
sdk_container/src/third_party/coreos-overlay/sys-kernel/coreos-firmware/Manifest	Bumps the referenced linux-firmware distfile to 20260622 (size + hashes).
sdk_container/src/third_party/coreos-overlay/sys-kernel/coreos-firmware/coreos-firmware-20260622.ebuild	Introduces a versioned ebuild for the 20260622 firmware snapshot.
changelog/updates/2026-07-09-linux-firmware-20260622-update.md	Documents the linux-firmware update with a link to the upstream tag.

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[dongsupark]

Please do not merge yet. This is going to cause a build failure again.
I will soon push a fix.

[dongsupark]

Okay, it looks like a more complicated issue than I expected.

Upstream linux-firmware simply deleted unlicensed firmware files, including acenic/tg1.bin and acenic/tg2.bin. Those firmware files are still necessary because Flatcar kernel config enables CONFIG_ACENIC. Kernel v7.1 finally decided to delete the unlicensed ACENIC driver, but it would take ages until Flatcar could get that Kernel, because the next target Kernel is 6.18.

[dongsupark]

For now I manually disabled Linux Firmware workflow to avoid further noise.