feat: Add new email alias to mailserver configuration

This commit adds a new email alias to the mailserver configuration. This new addition will allow emails sent to this address to be properly routed and received.

systems/x86_64-linux/sgx-attic/atticd.nix

@@ -0,0 +1,55 @@
+{ pkgs, lib, config, ... }:
+{
+  services.postgresql = {
+    enable = true;
+    ensureDatabases = [ "attic" ];
+    ensureUsers = [{ name = "atticd"; }];
+  };
+
+  systemd.services.postgresql.postStart = lib.mkAfter ''
+    $PSQL -tAc 'ALTER DATABASE "attic" OWNER TO "atticd"'
+  '';
+
+  environment.systemPackages = with pkgs; [
+    attic-client
+  ];
+  services.atticd = {
+    enable = true;
+
+    # Replace with absolute path to your credentials file
+    credentialsFile = "/etc/atticd.env";
+
+    settings = {
+      api-endpoint = "https://attic.teepot.org/";
+
+      garbage-collection.default-retention-period = "3 months";
+
+      database.url = "postgresql:///attic?host=/run/postgresql";
+
+      listen = "[::]:8080";
+
+      # Data chunking
+      #
+      # Warning: If you change any of the values here, it will be
+      # difficult to reuse existing chunks for newly-uploaded NARs
+      # since the cutpoints will be different. As a result, the
+      # deduplication ratio will suffer for a while after the change.
+      chunking = {
+        # The minimum NAR size to trigger chunking
+        #
+        # If 0, chunking is disabled entirely for newly-uploaded NARs.
+        # If 1, all NARs are chunked.
+        nar-size-threshold = 64 * 1024; # 64 KiB
+
+        # The preferred minimum size of a chunk, in bytes
+        min-size = 16 * 1024; # 16 KiB
+
+        # The preferred average size of a chunk, in bytes
+        avg-size = 64 * 1024; # 64 KiB
+
+        # The preferred maximum size of a chunk, in bytes
+        max-size = 256 * 1024; # 256 KiB
+      };
+    };
+  };
+}