nixos/paperless-ngx: fix startup order

The nixOS test failed sporadically with a timeout.
This is due to a race condition in the startup  of
the scheduler vs the task-queue.

The scheduler runs the migration scripts in "pre-start" and
celery isn't available, yet. The celery worker (paperless-task-queue)
was already started by systemd but was unable to connect
(as the migration scripts from "pre-start" still ran).

This fix adds the necessary "after" condition in the systemd
worker unit and adds a test to "paperless"

Signed-off-by: Florian Brandes <florian.brandes@posteo.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/nixos/modules/services/misc/paperless.nix b/nixos/modules/services/misc/paperless.nix
index 33a8394dff2..54c53a01134 100644
--- a/nixos/modules/services/misc/paperless.nix
+++ b/nixos/modules/services/misc/paperless.nix
@@ -258,6 +258,7 @@ in
         PrivateNetwork = false;
       };
       environment = env;
+      after = [ "paperless-scheduler.service" ];
     };
 
     # Reading the user-provided password file requires root access