Install pkgm alongside pkgx #133

Job	Run time
eval-posix-sh	14s
eval-bash	11s
eval-zsh	23s
install-pkgx (macos-latest)	4s
usage-as-proxy	19s
sudo-not-required	16s
install-pkgx (ubuntu-latest)	15s
multiple-apply-is-ok	13s
linuxen (debian:buster-slim)	18s
linuxen (debian:bullseye-slim)	19s
no-dirs (/usr/local)	16s
linuxen (debian:bookworm-slim)	20s
pkgm	22s
no-dirs (/usr/local/bin)	14s
linuxen (archlinux:latest)	24s
sudo-required	15s
linuxen (ubuntu:focal)	23s
upgrades	14s
linuxen (ubuntu:jammy)	26s
linuxen (ubuntu:noble)	24s
linuxen (fedora:latest)	25s
	6m 15s

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