Give a pointer to solution if bubblewrap runner cannot use user namespace #2843

Job	Run time
Build melange and add to artifact cache	28s
Build packages (bubblewrap, hello-wolfi)	1m 25s
Build packages (bubblewrap, glibc)	13m 33s
Build packages (bubblewrap, tini)	1m 8s
Build packages (bubblewrap, lzo)	1m 29s
Build packages (bubblewrap, bubblewrap)	1m 17s
Build packages (bubblewrap, gitsign)	2m 52s
Build packages (bubblewrap, guac)	3m 50s
Build packages (bubblewrap, mdbook)	3m 51s
Build packages (bubblewrap, s3cmd)	1m 9s
Build packages (bubblewrap, perl-yaml-syck)	1m 12s
Build packages (bubblewrap, ncurses)	2m 17s
Build packages (qemu, hello-wolfi)	1m 49s
Build packages (qemu, glibc)	14m 0s
Build packages (qemu, tini)	2m 4s
Build packages (qemu, lzo)	2m 5s
Build packages (qemu, bubblewrap)	1m 40s
Build packages (qemu, gitsign)	3m 16s
Build packages (qemu, guac)	4m 49s
Build packages (qemu, mdbook)	4m 29s
Build packages (qemu, s3cmd)	1m 35s
Build packages (qemu, perl-yaml-syck)	1m 41s
Build packages (qemu, ncurses)	2m 38s
	1h 14m 37s

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