Fix utility script bugs

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

lib/scripts/add-host.sh

@@ -17,7 +17,7 @@ ssh-keygen -t ed25519 -f "./hosts/${HOST}/secrets/ssh_host_ed25519_key" -N ""
 
 AGE_KEY=$(nix shell nixpkgs#ssh-to-age --command bash -c "cat './hosts/${HOST}/secrets/ssh_host_ed25519_key.pub' | ssh-to-age")
 
-for SOPS_FILE in $(find . -type f -name "sops.yaml"); do
+find . -type f -name "sops.yaml" | while IFS= read -r SOPS_FILE; do
   sed -i "/- hosts:/a\    - &${HOST} ${AGE_KEY}" "${SOPS_FILE}"
   sed -i "/- age:/a\        - *${HOST}" "${SOPS_FILE}"
 done