Expose PostgreSQL in Matrix service

Signed-off-by: magic_rb <magic_rb@redalder.org>

terranix/main/kubernetes/matrix.nix

@@ -602,6 +602,12 @@ in {
       };
       spec = {
         ports = [
+          {
+            name = "postgresql";
+            port = 5432;
+            protocol = "TCP";
+            targetPort = 5432;
+          }
           {
             name = "master-http";
             port = 6167;