fix: allow running docker runner as non-root user #2862

Job	Run time
Build melange and add to artifact cache	40s
Build packages (bubblewrap, hello-wolfi)	1m 30s
Build packages (bubblewrap, glibc)	13m 44s
Build packages (bubblewrap, tini)	1m 9s
Build packages (bubblewrap, lzo)	1m 39s
Build packages (bubblewrap, bubblewrap)	1m 10s
Build packages (bubblewrap, gitsign)	2m 41s
Build packages (bubblewrap, guac)	4m 0s
Build packages (bubblewrap, mdbook)	3m 49s
Build packages (bubblewrap, s3cmd)	1m 23s
Build packages (bubblewrap, perl-yaml-syck)	1m 14s
Build packages (bubblewrap, ncurses)	2m 13s
Build packages (qemu, hello-wolfi)	2m 10s
Build packages (qemu, glibc)	14m 2s
Build packages (qemu, tini)	1m 47s
Build packages (qemu, lzo)	1m 56s
Build packages (qemu, bubblewrap)	2m 9s
Build packages (qemu, gitsign)	3m 17s
Build packages (qemu, guac)	5m 3s
Build packages (qemu, mdbook)	4m 44s
Build packages (qemu, s3cmd)	2m 9s
Build packages (qemu, perl-yaml-syck)	1m 42s
Build packages (qemu, ncurses)	3m 33s
	1h 17m 44s

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