Added overlay for nsswitch.conf

Eric Renfrorequested to merge
garuda-linux_psi-jack/tools/iso-profiles:adding-nsswitch into master

This defines, during installation, enabling of mDNS resolving in the modern way of things. Combined with the following, this should be fully moved over in a transparent way and the only differences will be how it's implemented on new installations: https://gitlab.com/garuda-linux/packages/stable-pkgbuilds/garuda-hooks/-/merge_requests/4 https://gitlab.com/garuda-linux/packages/stable-pkgbuilds/samba-support/-/merge_requests/1

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