update for ubuntu nix

modules/secrets.nix

@@ -1,3 +1,11 @@
+# Generate age key
+# $ mkdir -p ~/.config/sops/age
+# $ age-keygen -o ~/.config/sops/age/keys.txt
+# Copy Public Key
+# $ age-keygen -y ~/.config/sops/age/keys.txt
+# Add it to .sops.yaml and update keys
+# $ sops updatekeys secrets/secrets.enc.yaml
+
 { config, lib, pkgs, ... }:
 
 {