nix: restore old home after installing elm-stuff
nix: restore old home after installing elm-stuff

lundjordan/services,La0/mozilla-relengapi,mozilla-releng/services,andrei987/services,lundjordan/services,srfraser/services,La0/mozilla-relengapi,mozilla-releng/services,mozilla-releng/services,srfraser/services,La0/mozilla-relengapi,garbas/mozilla-releng-services,lundjordan/services,andrei987/services,andrei987/services,andrei987/services,La0/mozilla-relengapi,lundjordan/services,garbas/mozilla-releng-services,srfraser/services,mozilla-releng/services,srfraser/services,garbas/mozilla-releng-services,garbas/mozilla-releng-services