feat(volume mounts): add support for mounting volumes into the melange build context #2937

Job	Run time
Build melange and add to artifact cache	40s
Build packages (bubblewrap, hello-wolfi)	1m 37s
Build packages (bubblewrap, glibc)	13m 42s
Build packages (bubblewrap, tini)	1m 15s
Build packages (bubblewrap, lzo)	1m 40s
Build packages (bubblewrap, bubblewrap)	1m 44s
Build packages (bubblewrap, gitsign)	2m 46s
Build packages (bubblewrap, guac)	4m 6s
Build packages (bubblewrap, mdbook)	3m 49s
Build packages (bubblewrap, s3cmd)	1m 17s
Build packages (bubblewrap, perl-yaml-syck)	1m 19s
Build packages (bubblewrap, ncurses)	2m 20s
Build packages (qemu, hello-wolfi)	1m 45s
Build packages (qemu, glibc)	14m 1s
Build packages (qemu, tini)	2m 20s
Build packages (qemu, lzo)	2m 0s
Build packages (qemu, bubblewrap)	1m 40s
Build packages (qemu, gitsign)	3m 25s
Build packages (qemu, guac)	4m 47s
Build packages (qemu, mdbook)	4m 27s
Build packages (qemu, s3cmd)	1m 51s
Build packages (qemu, perl-yaml-syck)	2m 0s
Build packages (qemu, ncurses)	3m 2s
	1h 17m 33s

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