clan-cli/secrets: suggest clan vars keygen instead

Found that while reading through some code.

devFlake/flake.lock

@@ -3,10 +3,10 @@
     "clan-core-for-checks": {
       "flake": false,
       "locked": {
-        "lastModified": 1759745582,
+        "lastModified": 1759795610,
-        "narHash": "sha256-EEU7h84Ojz3jBnPUgDiWrpBnBK3Ep3317qoFo1NvjXM=",
+        "narHash": "sha256-YFOK+aoJjWLfMHj2spvrQIe0ufIsv6P8o44NqoFPwp0=",
         "ref": "main",
-        "rev": "1cb7c7d25f40a4e1943e54adcbcd57c4d3a7dd84",
+        "rev": "0de79962eacfe6f09d7aabca2a7305deef4fde0c",
         "shallow": true,
         "type": "git",
         "url": "https://git.clan.lol/clan/clan-core"
@@ -105,11 +105,11 @@
     },
     "nixpkgs-dev": {
       "locked": {
-        "lastModified": 1759670943,
+        "lastModified": 1759794031,
-        "narHash": "sha256-JBjTDfwzAwtd8+5X/Weg27WE/3hVYOP3uggP2JPaQVQ=",
+        "narHash": "sha256-Zruni/00BlDHSWVJf3mb0o+OHnxIvJNuXkPloY9c+PU=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "21980a9c20f34648121f60bda15f419fa568db21",
+        "rev": "09c221b2f0726da85b124efb60a1d123971dfa08",
         "type": "github"
       },
       "original": {

pkgs/clan-cli/clan_cli/secrets/secrets.py

@@ -158,8 +158,10 @@ def encrypt_secret(
     admin_keys = sops.ensure_admin_public_keys(flake_dir)
 
     if not admin_keys:
-        # TODO double check the correct command to run
+        msg = (
-        msg = "No keys found. Please run 'clan secrets add-key' to add a key."
+            "No admin keys found.\n\n"
+            "Please run 'clan vars keygen' to generate and set up keys."
+        )
         raise ClanError(msg)
 
     username = next(iter(admin_keys)).username