feat: add sops-nix input

.sops.yaml

@@ -0,0 +1,14 @@
+# This example uses YAML anchors which allows reuse of multiple keys 
+# without having to repeat yourself.
+# Also see https://github.com/Mic92/dotfiles/blob/master/nixos/.sops.yaml
+# for a more complex example.
+keys:
+  - &ephase 26D5035DF6B4BE70F2B51B4C178139E02D2ACF00
+  - &luci age19kvatn3zpeqh9zy7u8ce0hqe7dyaesxrukewxt8u7pf4cqkj5dfqm5nlwy
+creation_rules:
+  - path_regex: secrets/[^/]+\.(yaml|json|env|ini)$
+    key_groups:
+    - age:
+      - *luci
+      pgp:
+      - *ephase