fix: Fix more installation errors and potential security flaws

system/sops.nix

@@ -1,4 +1,4 @@
-{inputs, ...}; let
+{inputs, ...}: let
   secretspath = builtins.toString inputs.nix-secrets;
 in
 {
@@ -9,11 +9,14 @@ in
   sops = {
     defaultSopsFile = "${secretspath}/secrets.yaml";
     age = {
+      # I'd prefer different OpenSSH keys for different hosts so I'm not 100% screwed if one of my devices get compromised.
+      # Therefore, we set a custom path for the sops key.
+      sshKeyPaths = ["/var/lib/sops-nix/ssh_host_ed25519_key"];
       keyFile = "/var/lib/sops-nix/key.txt";
       generateKey = false;
     };
     secrets = {
-      tera_passwd = {
+      tera_password = {
         neededForUsers = true;
       };
     };