tadpole: Add certs module

hosts/tadpole/modules/certs/default.nix

@@ -0,0 +1,12 @@
+{ ... }:
+{
+  security.acme = {
+    certs = {
+      "ppp.pm" = {
+        webroot = "/var/lib/acme/acme-challenge/";
+        email = "p@ppp.pm";
+        group = "nginx";
+      };
+    };
+  };
+}