Add django-prodserver as a dependency

[nanorepublica]

Description

django-prodserver is a package to centrally define the production processes to provide an interface to start them via a management command. This PR adds the necessary changes to settings and updates the scripts

Checklist:

• I've made sure that tests are updated accordingly (especially if adding or updating a template option)
• I've updated the documentation or confirm that my change doesn't require any updates

Rationale

[browniebroke]

I tried to deploy that to heroku and I'm getting some errors (Sentry public link)

Logs

Worker process:

heroku/worker.1 Starting process with command `REMAP_SIGTERM=SIGQUIT python manage.py prodserver worker`
heroku/worker.1 State changed from starting to up
app/worker.1 Starting server named worker
app/worker.1 Traceback (most recent call last):
app/worker.1   File "/app/manage.py", line 30, in <module>
app/worker.1     main()
app/worker.1     ~~~~^^
app/worker.1   File "/app/manage.py", line 26, in main
app/worker.1     execute_from_command_line(sys.argv)
app/worker.1     ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
app/worker.1   File "/app/.heroku/python/lib/python3.13/site-packages/django/core/management/__init__.py", line 442, in execute_from_command_line
app/worker.1     utility.execute()
app/worker.1     ~~~~~~~~~~~~~~~^^
app/worker.1   File "/app/.heroku/python/lib/python3.13/site-packages/django/core/management/__init__.py", line 436, in execute
app/worker.1     self.fetch_command(subcommand).run_from_argv(self.argv)
app/worker.1     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
app/worker.1   File "/app/.heroku/python/lib/python3.13/site-packages/django_prodserver/management/commands/prodserver.py", line 64, in run_from_argv
app/worker.1     self.start_server(*args, **cmd_options)
app/worker.1     ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
app/worker.1   File "/app/.heroku/python/lib/python3.13/site-packages/django_prodserver/management/commands/prodserver.py", line 102, in start_server
app/worker.1     backend.start_server(*backend.prep_server_args())
app/worker.1     ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
app/worker.1   File "/app/.heroku/python/lib/python3.13/site-packages/django_prodserver/backends/celery.py", line 18, in start_server
app/worker.1     self.app.Worker(*args).start()
app/worker.1     ~~~~~~~~~~~~~~~^^^^^^^
app/worker.1   File "/app/.heroku/python/lib/python3.13/site-packages/celery/worker/worker.py", line 94, in __init__
app/worker.1     self.app.loader.init_worker()
app/worker.1     ^^^^^^^^^^^^^^^
app/worker.1 AttributeError: 'str' object has no attribute 'loader'. Did you mean: 'lower'?
app/worker.1 Sentry is attempting to send 2 pending events
app/worker.1 Waiting up to 2 seconds
app/worker.1 Press Ctrl-C to quit
heroku/worker.1 State changed from up to crashed
heroku/worker.1 Process exited with status 1

Beat process:

app/beat.1 Starting server named beat
app/beat.1 Traceback (most recent call last):
app/beat.1   File "/app/manage.py", line 30, in <module>
app/beat.1     main()
app/beat.1     ~~~~^^
app/beat.1   File "/app/manage.py", line 26, in main
app/beat.1     execute_from_command_line(sys.argv)
app/beat.1     ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
app/beat.1   File "/app/.heroku/python/lib/python3.13/site-packages/django/core/management/__init__.py", line 442, in execute_from_command_line
app/beat.1     utility.execute()
app/beat.1     ~~~~~~~~~~~~~~~^^
app/beat.1   File "/app/.heroku/python/lib/python3.13/site-packages/django/core/management/__init__.py", line 436, in execute
app/beat.1     self.fetch_command(subcommand).run_from_argv(self.argv)
app/beat.1     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
app/beat.1   File "/app/.heroku/python/lib/python3.13/site-packages/django_prodserver/management/commands/prodserver.py", line 64, in run_from_argv
app/beat.1     self.start_server(*args, **cmd_options)
app/beat.1     ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
app/beat.1   File "/app/.heroku/python/lib/python3.13/site-packages/django_prodserver/management/commands/prodserver.py", line 102, in start_server
app/beat.1     backend.start_server(*backend.prep_server_args())
app/beat.1     ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
app/beat.1   File "/app/.heroku/python/lib/python3.13/site-packages/django_prodserver/backends/celery.py", line 26, in start_server
app/beat.1     self.app.Beat(*args).start()
app/beat.1     ^^^^^^^^^^^^^^^^^^^^^^^^^^
app/beat.1 AttributeError: 'Beat' object has no attribute 'start'
app/beat.1 Sentry is attempting to send 2 pending events
app/beat.1 Waiting up to 2 seconds
app/beat.1 Press Ctrl-C to quit
heroku/beat.1 State changed from up to crashed
heroku/beat.1 Process exited with status 1

That might have been due to a change in Celery... ?

[nanorepublica]

I have a project that was possibly erroring like this when trying to add celery with prodserver. Hopefully I'll have time over Christmas to look at this!