Test

Add default Nix overlay #8973

Job	Run time
alejandra	38s
prettier	36s
test	2m 29s
typos	32s
build-linux-libghostty	57s
build (namespace-profile-ghostty-md, aarch64-linux)	49s
build (namespace-profile-ghostty-md, x86_64-linux)	54s
build-macos	4m 5s
build-bench	52s
build-macos-matrix	11m 3s
build (namespace-profile-ghostty-md, x86-windows-gnu)	51s
build (namespace-profile-ghostty-md, x86_64-windows-gnu)	57s
build-nix (namespace-profile-ghostty-md)	2m 12s
build-windows	7m 54s
build-nix (namespace-profile-ghostty-md-arm64)	4m 56s
GTK adwaita=true x11=true	1m 0s
test-macos	2m 53s
GTK adwaita=true x11=false	56s
GTK adwaita=false x11=true	1m 2s
GTK adwaita=false x11=false	57s
	46m 33s

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