Add treefmt

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

lib/scripts/add-host.sh

@@ -1,4 +1,5 @@
 #!/usr/bin/env -S nix shell nixpkgs#ssh-to-age -c bash
+# shellcheck shell=bash
 
 set -o errexit
 set -o nounset
@@ -15,11 +16,11 @@ mkdir -p "./hosts/$host/secrets"
 
 ssh-keygen -t ed25519 -f "./hosts/$host/secrets/ssh_host_ed25519_key" -N ""
 
-age_key=$(cat './hosts/$host/secrets/ssh_host_ed25519_key.pub' | ssh-to-age)
+age_key=$(ssh-to-age < "./hosts/$host/secrets/ssh_host_ed25519_key.pub")
 
 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"
+  sed -i "/- hosts:/a\      - &$host $age_key" "$sops_file"
+  sed -i "/- age:/a\          - *$host" "$sops_file"
 done
 
 sed -i "/knownHosts = {/a\      $host.publicKeyFile = ../../../../$host/secrets/ssh_host_ed25519_key.pub;" ./hosts/common/configs/system/ssh/default.nix
@@ -29,4 +30,4 @@ sed -i "/userKnownHostsFile = lib.strings.concatStringsSep \" \" \[/a\        ..
 
 echo "Host $host has been successfully added."
 echo "You can generate SSH key pairs for any users that need to connect to user@host using the following command:"
-echo "ssh-keygen -t ed25519 -f ~/.ssh/id_ed25519_$host_<user>"
+echo "ssh-keygen -t ed25519 -f ~/.ssh/id_ed25519_${host}_<user>"