Improve some config parsing errors #2606

Job	Run time
Build melange and add to artifact cache	31s
Build packages (bubblewrap, hello-wolfi)	1m 14s
Build packages (bubblewrap, glibc)	11m 30s
Build packages (bubblewrap, tini)	1m 15s
Build packages (bubblewrap, lzo)	1m 21s
Build packages (bubblewrap, bubblewrap)	1m 3s
Build packages (bubblewrap, gitsign)	2m 32s
Build packages (bubblewrap, guac)	3m 24s
Build packages (bubblewrap, mdbook)	3m 45s
Build packages (bubblewrap, s3cmd)	1m 17s
Build packages (bubblewrap, perl-yaml-syck)	1m 6s
Build packages (bubblewrap, ncurses)	2m 10s
Build packages (qemu, hello-wolfi)	1m 47s
Build packages (qemu, glibc)	13m 24s
Build packages (qemu, tini)	1m 53s
Build packages (qemu, lzo)	2m 0s
Build packages (qemu, bubblewrap)	1m 50s
Build packages (qemu, gitsign)	3m 19s
Build packages (qemu, guac)	4m 18s
Build packages (qemu, mdbook)	4m 44s
Build packages (qemu, s3cmd)	1m 51s
Build packages (qemu, perl-yaml-syck)	1m 51s
Build packages (qemu, ncurses)	2m 58s
	1h 11m 3s

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