build(nix): use mktemp for wineprefix #46

Job	Run time
release / build-with-share / x86_64-linux	4m 45s
release / build (i686-linux, ubuntu-24.04) / i686-linux	4m 59s
release / build (armv6l-linux, ubuntu-24.04) / armv6l-linux	4m 56s
release / build (aarch64-darwin, macos-15) / aarch64-darwin	9m 4s
release / build (armv7l-linux, ubuntu-24.04) / armv7l-linux	4m 46s
release / build (x86_64-darwin, macos-15-intel) / x86_64-darwin	13m 23s
release / build (aarch64-linux, ubuntu-24.04) / aarch64-linux	5m 10s
release / build (x86_64-windows, ubuntu-24.04) / x86_64-windows	4m 49s
	51m 52s

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