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fix: nulファイル除外とステージ解除を追加 #70

Job	Run time
Test	31s
Build (ubuntu-latest, x86_64-unknown-linux-gnu)	49s
Build (windows-latest, x86_64-pc-windows-msvc)	1m 42s
Build (macos-latest, aarch64-apple-darwin)	1m 21s
Build (macos-latest, x86_64-apple-darwin)	1m 4s
	5m 27s