ci: delete build outputs if tests succeed #278

Job	Run time
Build container / Build container	17s
x86_64-pc-linux-gnu / Build depends	52s
x86_64-pc-linux-gnu_multiprocess / Build depends	58s
arm-linux-gnueabihf / Build depends	52s
x86_64-pc-linux-gnu_nowallet / Build depends	51s
x86_64-w64-mingw32 / Build depends	52s
linux64_nowallet-build / Build source	6m 33s
arm-linux-build / Build source	3m 58s
win64-build / Build source	10m 57s
linux64_fuzz-build / Build source	17m 3s
linux64-build / Build source	20m 22s
linux64_sqlite-build / Build source	6m 50s
linux64_ubsan-build / Build source	7m 20s
linux64_multiprocess-build / Build source	7m 17s
linux64_tsan-build / Build source	11m 22s
linux64_nowallet-test / Test source	13m 33s
linux64_sqlite-test / Test source	28m 54s
linux64_ubsan-test / Test source	34m 57s
linux64_multiprocess-test / Test source	33m 11s
linux64_tsan-test / Test source	1h 5m 14s
linux64-test / Test source	33m 2s
	5h 5m 15s

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