reduce disk usage during write #871

Job	Run time
cancel-old-build	3s
test-linux (debug)	57s
build-linux (debug, static_lib)	20s
build-darwin (debug, static_lib, x64)	2m 0s
build-linux (debug, shared_lib)	27s
build-darwin (debug, static_lib, arm64)	28s
build-win32 (debug, static_lib)	45s
test-linux (release)	57s
build-darwin (debug, shared_lib, x64)	44s
build-linux (debug, cmd)	42s
build-win32 (debug, shared_lib)	52s
build-darwin (debug, shared_lib, arm64)	44s
build-linux (release, static_lib)	1m 18s
build-win32 (debug, cmd)	37s
test-darwin (debug, arm64)	37s
build-darwin (debug, cmd, x64)	59s
build-linux (release, shared_lib)	52s
build-win32 (release, static_lib)	1m 35s
test-darwin (debug, x64)	50s
build-darwin (debug, cmd, arm64)	56s
build-linux (release, cmd)	52s
build-win32 (release, shared_lib)	1m 43s
test-darwin (release, arm64)	1m 17s
build-darwin (release, static_lib, x64)	1m 9s
build-win32 (release, cmd)	1m 35s
test-darwin (release, x64)	58s
build-darwin (release, static_lib, arm64)	1m 1s
test-win32 (debug)	1m 16s
build-darwin (release, shared_lib, x64)	1m 9s
test-win32 (release)	1m 44s
build-darwin (release, shared_lib, arm64)	52s
build-darwin (release, cmd, x64)	57s
build-darwin (release, cmd, arm64)	1m 32s
dist-linux	12s
dist-win32	24s
dist-darwin (x64)	29s
dist-darwin (arm64)	2m 21s
	36m 14s

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