build

Run `std/optimize_for_size` in nightly CI (#65) #124

Job	Run time
no_main-win (stable)	44s
no_std-win (stable)	45s
no_main-win (nightly)	32s
Default (ubuntu-latest, stable)	14s
no_std-win (nightly)	32s
no_std (ubuntu-latest, stable)	14s
Default (ubuntu-latest, nightly)	11s
no_std (ubuntu-latest, nightly)	13s
Default (macos-latest, stable)	20s
build-std (build_std)	40s
no_std (macos-latest, stable)	26s
Default (macos-latest, nightly)	17s
build-std (no_main/nix)	40s
no_std (macos-latest, nightly)	19s
Default (windows-latest, stable)	32s
Default (windows-latest, nightly)	30s
	7m 9s

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