Non-fatal error during compose-up calling postgres-prepare

I see this error (seemingly from dynaconf) during compose up. It doesn't stop the machine from launching so not sure what is going on. Using pulpcore & pulp_file on main.

pulp_1   | Calling /etc/init/postgres-prepare
pulp_1   | 2022-09-28 20:17:15.957 UTC [596] LOG:  starting PostgreSQL 12.11 on x86_64-redhat-linux-gnu, compiled by gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-13), 64-bit
pulp_1   | 2022-09-28 20:17:15.958 UTC [596] LOG:  listening on IPv4 address "127.0.0.1", port 5432
pulp_1   | 2022-09-28 20:17:15.958 UTC [596] LOG:  could not bind IPv6 address "::1": Cannot assign requested address
pulp_1   | 2022-09-28 20:17:15.958 UTC [596] HINT:  Is another postmaster already running on port 5432? If not, wait a few seconds and retry.
pulp_1   | 2022-09-28 20:17:15.959 UTC [596] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
pulp_1   | 2022-09-28 20:17:15.961 UTC [596] LOG:  listening on Unix socket "/tmp/.s.PGSQL.5432"
pulp_1   | 2022-09-28 20:17:15.968 UTC [596] LOG:  redirecting log output to logging collector process
pulp_1   | 2022-09-28 20:17:15.968 UTC [596] HINT:  Future log output will appear in directory "log".
pulp_1   | Traceback (most recent call last):
pulp_1   |   File "/usr/local/bin/pulpcore-manager", line 8, in <module>
pulp_1   |     sys.exit(manage())
pulp_1   |   File "/src/pulpcore/pulpcore/app/manage.py", line 11, in manage
pulp_1   |     execute_from_command_line(sys.argv)
pulp_1   |   File "/usr/local/lib/python3.8/site-packages/django/core/management/__init__.py", line 419, in execute_from_command_line
pulp_1   |     utility.execute()
pulp_1   |   File "/usr/local/lib/python3.8/site-packages/django/core/management/__init__.py", line 363, in execute
pulp_1   |     settings.INSTALLED_APPS
pulp_1   |   File "/usr/local/lib/python3.8/site-packages/django/conf/__init__.py", line 82, in __getattr__
pulp_1   |     self._setup(name)
pulp_1   |   File "/usr/local/lib/python3.8/site-packages/django/conf/__init__.py", line 69, in _setup
pulp_1   |     self._wrapped = Settings(settings_module)
pulp_1   |   File "/usr/local/lib/python3.8/site-packages/django/conf/__init__.py", line 170, in __init__
pulp_1   |     mod = importlib.import_module(self.SETTINGS_MODULE)
pulp_1   |   File "/usr/lib64/python3.8/importlib/__init__.py", line 127, in import_module
pulp_1   |     return _bootstrap._gcd_import(name[level:], package, level)
pulp_1   |   File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
pulp_1   |   File "<frozen importlib._bootstrap>", line 991, in _find_and_load
pulp_1   |   File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
pulp_1   |   File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
pulp_1   |   File "<frozen importlib._bootstrap_external>", line 843, in exec_module
pulp_1   |   File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
pulp_1   |   File "/src/pulpcore/pulpcore/app/settings.py", line 299, in <module>
pulp_1   |     from dynaconf import DjangoDynaconf, Validator  # noqa
pulp_1   |   File "/usr/local/lib/python3.8/site-packages/dynaconf/__init__.py", line 3, in <module>
pulp_1   |     from dynaconf.base import LazySettings  # noqa
pulp_1   |   File "/usr/local/lib/python3.8/site-packages/dynaconf/base.py", line 17, in <module>
pulp_1   |     from dynaconf.loaders import env_loader
pulp_1   |   File "/usr/local/lib/python3.8/site-packages/dynaconf/loaders/env_loader.py", line 8, in <module>
pulp_1   |     from dynaconf.vendor.dotenv import cli as dotenv_cli
pulp_1   |   File "/usr/local/lib/python3.8/site-packages/dynaconf/vendor/dotenv/cli.py", line 16, in <module>
pulp_1   |     @click.option('-f','--file',default=os.path.join(os.getcwd(),'.env'),type=click.Path(exists=_A),help='Location of the .env file, defaults to .env file in current working directory.')
pulp_1   | FileNotFoundError: [Errno 2] No such file or directory
pulp_1   | Operations to perform:
pulp_1   |   Apply all migrations: auth, contenttypes, core, file, python, sessions
pulp_1   | Running migrations:
pulp_1   |   No migrations to apply.

Start by reproducing compose up and tracing /etc/init/postgres-prepare into pulpcore/pulpcore/app/settings.py:299 and the dynaconf import shown in the traceback. Done means identifying the cause of the FileNotFoundError and IPv6 bind message, then documenting or correcting the expected compose behavior.