Add `uenv build` command #122

# to view logs

Job	Run time
build-and-test (debug, none)	1m 52s
build-and-test (debug, address)	1m 59s
build-and-test (debug, leak)	1m 36s
build-and-test (debug, undefined)	2m 45s
build-and-test (debug, thread)	1m 44s
build-and-test (release, none)	1m 21s
build-and-test (release, leak)	1m 21s
build-and-test (release, undefined)	1m 54s
build-and-test (release, thread)	1m 42s
	16m 14s

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