LOG_FILENAME should be configurable

[JP95Git]

With commit 663871a it is possible to change the barman config file. But the log file LOG_FILENAME is still fixed to /var/log/barman/barman-api.log.

Running pg-backup-api as a user with very strict priviliges I get this error:

[2025-09-15 16:20:05 +0200] [2155515] [INFO] Starting gunicorn 23.0.0
[2025-09-15 16:20:05 +0200] [2155515] [INFO] Listening at: http://0.0.0.0:7480 (2155515)
[2025-09-15 16:20:05 +0200] [2155515] [INFO] Using worker: sync
[2025-09-15 16:20:05 +0200] [2155516] [INFO] Booting worker with pid: 2155516
[2025-09-15 16:20:05 +0200] [2155516] [ERROR] Exception in worker process
Traceback (most recent call last):
  File "/usr/lib64/python3.9/logging/config.py", line 564, in configure
    handler = self.configure_handler(handlers[name])
  File "/usr/lib64/python3.9/logging/config.py", line 745, in configure_handler
    result = factory(**kwargs)
  File "/usr/lib64/python3.9/logging/__init__.py", line 1146, in __init__
    StreamHandler.__init__(self, self._open())
  File "/usr/lib64/python3.9/logging/__init__.py", line 1175, in _open
    return open(self.baseFilename, self.mode, encoding=self.encoding,
FileNotFoundError: [Errno 2] No such file or directory: '/var/log/barman/barman-api.log'

My workaround is to change the path in the sources:
find . -type f -name "*.py" -exec sed -i 's|/var/log/barman/barman-api.log|/my/path/to/barman-api.log|g' {} +
and compile it again:
python3 setup.py install

I used a venv of Python.