build

Add `distroless` to README.md #158

Job	Run time
build-std (no_main/nix)	48s
no_main-win (stable)	35s
no_std (ubuntu-latest, nightly)	16s
no_main-win (nightly)	27s
build-std (build_std)	45s
no_std (ubuntu-latest, stable)	15s
no_std-win (stable)	37s
no_std (macos-latest, nightly)	21s
no_std (macos-latest, stable)	13s
Default (ubuntu-latest, nightly)	14s
Default (ubuntu-latest, stable)	23s
no_std-win (nightly)	34s
Default (macos-latest, stable)	14s
Default (windows-latest, stable)	1m 25s
Default (macos-latest, nightly)	19s
Default (windows-latest, nightly)	31s
	7m 57s

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