Fix gunicorn invocation

[otbutz]

This gets rid of the --factory warning. Source: https://stackoverflow.com/a/25319752

Before:

[2024-09-27 08:03:30 +0200] [7] [INFO] Starting gunicorn 23.0.0
[2024-09-27 08:03:30 +0200] [7] [INFO] Listening at: unix:/run/nominatim.sock (7)
[2024-09-27 08:03:30 +0200] [7] [INFO] Using worker: uvicorn.workers.UvicornWorker
[2024-09-27 08:03:30 +0200] [41] [INFO] Booting worker with pid: 41
[2024-09-27 08:03:30 +0200] [42] [INFO] Booting worker with pid: 42
[2024-09-27 08:03:30 +0200] [43] [INFO] Booting worker with pid: 43
[2024-09-27 08:03:30 +0200] [44] [INFO] Booting worker with pid: 44
[2024-09-27 08:03:30 +0200] [44] [WARNING] ASGI app factory detected. Using it, but please consider setting the --factory flag explicitly.
[2024-09-27 08:03:30 +0200] [41] [WARNING] ASGI app factory detected. Using it, but please consider setting the --factory flag explicitly.
[2024-09-27 08:03:30 +0200] [44] [INFO] Started server process [44]
[2024-09-27 08:03:30 +0200] [44] [INFO] Waiting for application startup.
[2024-09-27 08:03:30 +0200] [41] [INFO] Started server process [41]
[2024-09-27 08:03:30 +0200] [41] [INFO] Waiting for application startup.
[2024-09-27 08:03:30 +0200] [42] [WARNING] ASGI app factory detected. Using it, but please consider setting the --factory flag explicitly.
[2024-09-27 08:03:30 +0200] [44] [INFO] Application startup complete.
[2024-09-27 08:03:30 +0200] [41] [INFO] Application startup complete.
[2024-09-27 08:03:30 +0200] [42] [INFO] Started server process [42]
[2024-09-27 08:03:30 +0200] [42] [INFO] Waiting for application startup.
[2024-09-27 08:03:30 +0200] [42] [INFO] Application startup complete.
[2024-09-27 08:03:30 +0200] [43] [WARNING] ASGI app factory detected. Using it, but please consider setting the --factory flag explicitly.
[2024-09-27 08:03:30 +0200] [43] [INFO] Started server process [43]
[2024-09-27 08:03:30 +0200] [43] [INFO] Waiting for application startup.
[2024-09-27 08:03:30 +0200] [43] [INFO] Application startup complete.

After:

[2024-10-09 10:04:45 +0200] [7] [INFO] Starting gunicorn 23.0.0
[2024-10-09 10:04:45 +0200] [7] [INFO] Listening at: unix:/run/nominatim.sock (7)
[2024-10-09 10:04:45 +0200] [7] [INFO] Using worker: uvicorn.workers.UvicornWorker
[2024-10-09 10:04:45 +0200] [41] [INFO] Booting worker with pid: 41
[2024-10-09 10:04:45 +0200] [42] [INFO] Booting worker with pid: 42
[2024-10-09 10:04:45 +0200] [43] [INFO] Booting worker with pid: 43
[2024-10-09 10:04:45 +0200] [44] [INFO] Booting worker with pid: 44
[2024-10-09 10:04:45 +0200] [41] [INFO] Started server process [41]
[2024-10-09 10:04:45 +0200] [41] [INFO] Waiting for application startup.
[2024-10-09 10:04:45 +0200] [41] [INFO] Application startup complete.
[2024-10-09 10:04:45 +0200] [42] [INFO] Started server process [42]
[2024-10-09 10:04:45 +0200] [42] [INFO] Waiting for application startup.
[2024-10-09 10:04:45 +0200] [42] [INFO] Application startup complete.
[2024-10-09 10:04:45 +0200] [43] [INFO] Started server process [43]
[2024-10-09 10:04:45 +0200] [43] [INFO] Waiting for application startup.
[2024-10-09 10:04:45 +0200] [43] [INFO] Application startup complete.
[2024-10-09 10:04:45 +0200] [44] [INFO] Started server process [44]
[2024-10-09 10:04:45 +0200] [44] [INFO] Waiting for application startup.
[2024-10-09 10:04:45 +0200] [44] [INFO] Application startup complete.

[otbutz]

@lonvia WDYT?