minor go cleanup and some performance improvements #3064

Job	Run time
Build melange and add to artifact cache	37s
Build packages (bubblewrap, hello-wolfi)	1m 32s
Build packages (bubblewrap, glibc)	14m 20s
Build packages (bubblewrap, tini)	1m 14s
Build packages (bubblewrap, lzo)	1m 29s
Build packages (bubblewrap, bubblewrap)	1m 26s
Build packages (bubblewrap, gitsign)	2m 40s
Build packages (bubblewrap, guac)	4m 14s
Build packages (bubblewrap, mdbook)	4m 32s
Build packages (bubblewrap, s3cmd)	1m 32s
Build packages (bubblewrap, perl-yaml-syck)	1m 27s
Build packages (bubblewrap, ncurses)	2m 33s
Build packages (qemu, hello-wolfi)	2m 3s
Build packages (qemu, glibc)	14m 13s
Build packages (qemu, tini)	1m 46s
Build packages (qemu, lzo)	3m 12s
Build packages (qemu, bubblewrap)	1m 50s
Build packages (qemu, gitsign)	3m 19s
Build packages (qemu, guac)	5m 6s
Build packages (qemu, mdbook)	4m 35s
Build packages (qemu, s3cmd)	1m 43s
Build packages (qemu, perl-yaml-syck)	2m 24s
Build packages (qemu, ncurses)	3m 18s
	1h 21m 5s

Provide feedback