netbox-docker: Unable to use collectstatic command in Dockerfile

[Kani999]

Running manage.py collectstatic within a Dockerfile causes error.
Dockerfile example:

FROM netboxcommunity/netbox:latest

COPY ./plugin_requirements.txt /
RUN /opt/netbox/venv/bin/pip install  --no-warn-script-location -r /plugin_requirements.txt

# These lines are only required if your plugin has its own static files.
COPY configuration/configuration.py /etc/netbox/config/configuration.py
RUN SECRET_KEY="dummy" /opt/netbox/venv/bin/python /opt/netbox/netbox/manage.py collectstatic --no-input

Error when docker-compose build:

Traceback (most recent call last):
  File "/opt/netbox/netbox/manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/opt/netbox/venv/lib/python3.10/site-packages/django/core/management/__init__.py", line 446, in execute_from_command_line
    utility.execute()
  File "/opt/netbox/venv/lib/python3.10/site-packages/django/core/management/__init__.py", line 420, in execute
    django.setup()
  File "/opt/netbox/venv/lib/python3.10/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/opt/netbox/venv/lib/python3.10/site-packages/django/apps/registry.py", line 124, in populate
    app_config.ready()
  File "/opt/netbox/netbox/extras/plugins/__init__.py", line 68, in ready
    template_extensions = import_object(f"{self.__module__}.{self.template_extensions}")
  File "/opt/netbox/netbox/extras/plugins/utils.py", line 31, in import_object
    spec.loader.exec_module(module)
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/opt/netbox-attachments/netbox_attachments/template_content.py", line 46, in <module>
    for content_type in ContentType.objects.all():
  File "/opt/netbox/venv/lib/python3.10/site-packages/django/db/models/query.py", line 320, in __iter__
    self._fetch_all()
  File "/opt/netbox/venv/lib/python3.10/site-packages/django/db/models/query.py", line 1507, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "/opt/netbox/venv/lib/python3.10/site-packages/django/db/models/query.py", line 57, in __iter__
    results = compiler.execute_sql(
  File "/opt/netbox/venv/lib/python3.10/site-packages/django/db/models/sql/compiler.py", line 1359, in execute_sql
    cursor = self.connection.cursor()
  File "/opt/netbox/venv/lib/python3.10/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/opt/netbox/venv/lib/python3.10/site-packages/django/db/backends/base/base.py", line 284, in cursor
    return self._cursor()
  File "/opt/netbox/venv/lib/python3.10/site-packages/django/db/backends/base/base.py", line 260, in _cursor
    self.ensure_connection()
  File "/opt/netbox/venv/lib/python3.10/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/opt/netbox/venv/lib/python3.10/site-packages/django/db/backends/base/base.py", line 243, in ensure_connection
    with self.wrap_database_errors:
  File "/opt/netbox/venv/lib/python3.10/site-packages/django/db/utils.py", line 91, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/opt/netbox/venv/lib/python3.10/site-packages/django/db/backends/base/base.py", line 244, in ensure_connection
    self.connect()
  File "/opt/netbox/venv/lib/python3.10/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/opt/netbox/venv/lib/python3.10/site-packages/django/db/backends/base/base.py", line 225, in connect
    self.connection = self.get_new_connection(conn_params)
  File "/opt/netbox/venv/lib/python3.10/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/opt/netbox/venv/lib/python3.10/site-packages/django/db/backends/postgresql/base.py", line 203, in get_new_connection
    connection = Database.connect(**conn_params)
  File "/opt/netbox/venv/lib/python3.10/site-packages/psycopg2/__init__.py", line 122, in connect
    conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
django.db.utils.OperationalError: connection to server at "localhost" (127.0.0.1), port 5432 failed: Connection refused
        Is the server running on that host and accepting TCP/IP connections?

Reason:

• Loads /opt/netbox-attachments/netbox_attachments/template_content.py file, which iterates through ContentType.objects.all():
• Database is not UP when running this command
• Returns connection to server at "localhost" (127.0.0.1), port 5432 failed: Connection refused