feat(volume mounts): add support for mounting volumes into the melange build context #2945

Job	Run time
Build melange and add to artifact cache	35s
Build packages (bubblewrap, hello-wolfi)	1m 23s
Build packages (bubblewrap, glibc)	13m 22s
Build packages (bubblewrap, tini)	1m 11s
Build packages (bubblewrap, lzo)	1m 29s
Build packages (bubblewrap, bubblewrap)	1m 27s
Build packages (bubblewrap, gitsign)	2m 48s
Build packages (bubblewrap, guac)	3m 52s
Build packages (bubblewrap, mdbook)	3m 52s
Build packages (bubblewrap, s3cmd)	1m 11s
Build packages (bubblewrap, perl-yaml-syck)	1m 26s
Build packages (bubblewrap, ncurses)	2m 19s
Build packages (qemu, hello-wolfi)	2m 24s
Build packages (qemu, glibc)	13m 47s
Build packages (qemu, tini)	1m 45s
Build packages (qemu, lzo)	1m 59s
Build packages (qemu, bubblewrap)	2m 16s
Build packages (qemu, gitsign)	3m 18s
Build packages (qemu, guac)	4m 47s
Build packages (qemu, mdbook)	4m 34s
Build packages (qemu, s3cmd)	2m 2s
Build packages (qemu, perl-yaml-syck)	1m 45s
Build packages (qemu, ncurses)	2m 53s
	1h 16m 25s

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