drop pkg/logger and use slog #1080

Job	Run time
Build melange and add to artifact cache	16s
Build packages (hello-wolfi)	40s
Build packages (glibc)	8m 56s
Build packages (tini)	50s
Build packages (lzo)	1m 0s
Build packages (bubblewrap)	28s
Build packages (gdk-pixbuf)	1m 10s
Build packages (gitsign)	1m 49s
Build packages (guac)	2m 25s
Build packages (mdbook)	5m 15s
Build packages (s3cmd)	38s
Build packages (perl-yaml-syck)	48s
Build packages (xmlto)	46s
Build packages (ncurses)	2m 15s
	27m 16s

Provide feedback