add --cleanup flag (default true) #2597

Job	Run time
Build melange and add to artifact cache	31s
Build packages (bubblewrap, hello-wolfi)	1m 37s
Build packages (bubblewrap, glibc)	11m 39s
Build packages (bubblewrap, tini)	1m 6s
Build packages (bubblewrap, lzo)	1m 23s
Build packages (bubblewrap, bubblewrap)	1m 2s
Build packages (bubblewrap, gitsign)	2m 50s
Build packages (bubblewrap, guac)	3m 23s
Build packages (bubblewrap, mdbook)	3m 53s
Build packages (bubblewrap, s3cmd)	1m 4s
Build packages (bubblewrap, perl-yaml-syck)	1m 10s
Build packages (bubblewrap, ncurses)	2m 4s
Build packages (qemu, hello-wolfi)	2m 7s
Build packages (qemu, glibc)	12m 55s
Build packages (qemu, tini)	1m 38s
Build packages (qemu, lzo)	2m 0s
Build packages (qemu, bubblewrap)	1m 44s
Build packages (qemu, gitsign)	3m 33s
Build packages (qemu, guac)	4m 24s
Build packages (qemu, mdbook)	4m 34s
Build packages (qemu, s3cmd)	1m 37s
Build packages (qemu, perl-yaml-syck)	1m 37s
Build packages (qemu, ncurses)	3m 1s
	1h 10m 52s

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