pkgr doesn't reliably exit with non-zero status on error

[kyleam]

When trying to use pkgr in an automated setting, I've recently been bitten by the fact that pkgr install doesn't reliably indicate failure with a non-zero status. (I think I've seen pkgr install exit with a non-zero status in some cases, so perhaps it's just about what phase failed). I hadn't got around to opening an issue, but I see that @bschulth just reported the same, so here's a dedicated issue.

@bschulth Fwiw I've been using (the equivalent of) this workaround to catch errors:

log=/path/to/pkgr/install/log/file
test -n "$(jq 'select(.level == "error") | .level' <"$log")" && exit 1