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ci: free runner disk space and pin the update runner to ubuntu-26.04 - #161
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The validation build unpacks a 12.5 GiB closure and overflowed the hosted runner's free space, so the 2026-11-04 AI input update stopped before creating its PR. Remove the large preinstalled toolchains before installing Nix, and pin the image to ubuntu-26.04 (GA since September) so the disk size stays predictable while ubuntu-latest migrates.
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背景
今日（2026-11-04）の
Bot: Update AI agent inputsが失敗していました。検証 step（
nix build .#homeConfigurations."nosuke@linux-x86_64".activationPackage）が展開に 12.5 GiB を要求し、ubuntu-24.04 ランナーの空き（約 14 GiB）を超えました。前日は 11.8 GiB でギリギリ通っていた状態です。ログ中のcodex-0.166.0 ... no substituterはディスク不足による巻き添えで、キャッシュには存在します。変更
/usr/local/lib/android・/usr/share/dotnet・/opt/ghc・CodeQL・Docker イメージを削除。24.04 相当のランナーでも余裕ができます。runs-onをubuntu-26.04に固定:ubuntu-latestは 2026-11 中（〜11/19）に 24.04 から 26.04 へ移行中で、世代が予告なく変わるため明示します。26.04 は 9 月に GA 済みです。両方の flake 更新ワークフロー（AI / stable）に同じ変更を入れています。
検証
一時ワークフローで
ubuntu-26.04ランナー上での実行を確認済み（その後削除）:nix build ... activationPackageが 3分42秒で成功zizmor/ actionlint による指摘なし（actionlint は 26.04 ラベルを知らない古い定義のため警告のみ、CI では未使用）