Plain `unshare --user --map-root-user` fails on kernels and containers
that block unprivileged writes to /proc/self/uid_map (e.g. GitHub Actions,
restricted AppArmor profiles). On those systems util-linux delegates to the
setuid newuidmap/newgidmap helpers when --map-auto is also present.
Add the combined form as a fallback candidate and build the launcher args
from the probed mapping, so systems without newuidmap/newgidmap or a
/etc/subuid range keep using the plain form.