minor go cleanup and some performance improvements #3061

Job	Run time
Build melange and add to artifact cache	44s
Build packages (bubblewrap, hello-wolfi)	1m 26s
Build packages (bubblewrap, glibc)	16m 16s
Build packages (bubblewrap, tini)	1m 16s
Build packages (bubblewrap, lzo)	1m 59s
Build packages (bubblewrap, bubblewrap)	1m 19s
Build packages (bubblewrap, gitsign)	2m 38s
Build packages (bubblewrap, guac)	3m 52s
Build packages (bubblewrap, mdbook)	3m 47s
Build packages (bubblewrap, s3cmd)	1m 24s
Build packages (bubblewrap, perl-yaml-syck)	1m 26s
Build packages (bubblewrap, ncurses)	2m 23s
Build packages (qemu, hello-wolfi)	2m 40s
Build packages (qemu, glibc)	14m 12s
Build packages (qemu, tini)	1m 53s
Build packages (qemu, lzo)	2m 17s
Build packages (qemu, bubblewrap)	1m 45s
Build packages (qemu, gitsign)	3m 36s
Build packages (qemu, guac)	5m 31s
Build packages (qemu, mdbook)	5m 9s
Build packages (qemu, s3cmd)	1m 42s
Build packages (qemu, perl-yaml-syck)	2m 9s
Build packages (qemu, ncurses)	2m 44s
	1h 22m 8s

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