Consolidate build user/group strings #3171

Job	Run time
Build melange and add to artifact cache	41s
Build packages (bubblewrap, hello-wolfi)	1m 40s
Build packages (bubblewrap, glibc)	13m 47s
Build packages (bubblewrap, tini)	1m 19s
Build packages (bubblewrap, lzo)	1m 34s
Build packages (bubblewrap, bubblewrap)	1m 30s
Build packages (bubblewrap, gitsign)	2m 52s
Build packages (bubblewrap, guac)	4m 10s
Build packages (bubblewrap, mdbook)	4m 3s
Build packages (bubblewrap, s3cmd)	1m 27s
Build packages (bubblewrap, perl-yaml-syck)	1m 30s
Build packages (bubblewrap, ncurses)	2m 19s
Build packages (qemu, hello-wolfi)	2m 39s
Build packages (qemu, glibc)	15m 58s
Build packages (qemu, tini)	2m 35s
Build packages (qemu, lzo)	2m 36s
Build packages (qemu, bubblewrap)	2m 18s
Build packages (qemu, gitsign)	4m 36s
Build packages (qemu, guac)	6m 2s
Build packages (qemu, mdbook)	5m 43s
Build packages (qemu, s3cmd)	2m 10s
Build packages (qemu, perl-yaml-syck)	2m 25s
Build packages (qemu, ncurses)	3m 21s
	1h 27m 15s

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