nixos: services: forgejo: fix deprecated config

Turns out the package update [1] was because someone couldn't make it
work on the previous version, and added a new setting to configure it
more easily :-).

[1]: https://github.com/NixOS/nixpkgs/pull/314294

modules/nixos/services/forgejo/default.nix

@@ -83,7 +83,11 @@ in
         # I configure my backup system manually below.
         dump.enable = false;
 
-        mailerPasswordFile = lib.mkIf cfg.mail.enable cfg.mail.passwordFile;
+        secrets = {
+          mailer = lib.mkIf cfg.mail.enable {
+            PASSWD = cfg.mail.passwordFile;
+          };
+        };
 
         settings = {
           DEFAULT = {

modules/nixos/services/mealie/default.nix

@@ -35,12 +35,8 @@ in
 
         # Use PostgreSQL
         DB_ENGINE = "postgres";
-        POSTGRES_USER = "mealie";
-        POSTGRES_PASSWORD = "";
-        POSTGRES_SERVER = "/run/postgresql";
-        # Pydantic and/or mealie doesn't handle the URI correctly, hijack it
-        # with query parameters...
-        POSTGRES_DB = "mealie?host=/run/postgresql&dbname=mealie";
+        # Make it work with socket auth
+        POSTGRES_URL_OVERRIDE = "postgresql://mealie:@/mealie?host=/run/postgresql";
       };
     };