nixos/gitlab: Enable roation of log files

This commit enables a logrotate service for gitlab using the default
values from omnibus. [1]

[1] https://gitlab.com/gitlab-org/omnibus-gitlab/-/blob/master/files/gitlab-cookbooks/gitlab/attributes/default.rb#L754

Resolves #136723

nixos/modules/services/misc/gitlab.nix

@@ -821,6 +821,40 @@ in {
         '';
       };
 
+      logrotate = {
+        enable = mkOption {
+          type = types.bool;
+          default = true;
+          description = ''
+            Enable rotation of log files.
+          '';
+        };
+
+        frequency = mkOption {
+          type = types.str;
+          default = "daily";
+          description = "How often to rotate the logs.";
+        };
+
+        keep = mkOption {
+          type = types.int;
+          default = 30;
+          description = "How many rotations to keep.";
+        };
+
+        extraConfig = mkOption {
+          type = types.lines;
+          default = ''
+            copytruncate
+            compress
+          '';
+          description = ''
+            Extra logrotate config options for this path. Refer to
+            <link xlink:href="https://linux.die.net/man/8/logrotate"/> for details.
+          '';
+        };
+      };
+
       extraConfig = mkOption {
         type = types.attrs;
         default = {};
@@ -932,6 +966,21 @@ in {
       ensureUsers = singleton { name = cfg.databaseUsername; };
     };
 
+    # Enable rotation of log files
+    services.logrotate = {
+      enable = cfg.logrotate.enable;
+      paths = {
+        gitlab = {
+          path = "${cfg.statePath}/log/*.log";
+          user = cfg.user;
+          group = cfg.group;
+          frequency = cfg.logrotate.frequency;
+          keep = cfg.logrotate.keep;
+          extraConfig = cfg.logrotate.extraConfig;
+        };
+      };
+    };
+
     # The postgresql module doesn't currently support concepts like
     # objects owners and extensions; for now we tack on what's needed
     # here.