Cannot run webserver in nixos-container

I have a container called fabio inside which I have a django project installed,with the manage corresponding to its
However when I try

sudo nixos-container run fabio -- sudo -u mysite manage runserver_plus
[sudo] password di paki: 
System check identified some issues:

?: (urls.W002) Your URL pattern '/comment' has a route beginning with a '/'. Remove this slash as it is unnecessary. If this pattern is targeted in an include(), ensure the include() pattern has a trailing '/'.
            SELECT c.relname,
            CASE WHEN c.relispartition THEN 'p' WHEN c.relkind IN ('m', 'v') THEN 'v' ELSE 't' END
            FROM pg_catalog.pg_class c
            LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
            WHERE c.relkind IN ('f', 'm', 'p', 'r', 'v')
                AND n.nspname NOT IN ('pg_catalog', 'pg_toast')
                AND pg_catalog.pg_table_is_visible(c.oid)
        ; args=None
(0.001) SELECT "django_migrations"."app", "django_migrations"."name" FROM "django_migrations"; args=()
Traceback (most recent call last):
  File "/nix/store/82wxnj0jpadla8fd2fhjfdcjw36iy2yz-lavoro-fabio-git/", line 17, in <module>
  File "/nix/store/d3j918sarybg6h011bqsf6wk9gz351xh-python3-3.7.6-env/lib/python3.7/site-packages/django/core/management/", line 381, in execute_from_command_line
  File "/nix/store/d3j918sarybg6h011bqsf6wk9gz351xh-python3-3.7.6-env/lib/python3.7/site-packages/django/core/management/", line 375, in execute
  File "/nix/store/d3j918sarybg6h011bqsf6wk9gz351xh-python3-3.7.6-env/lib/python3.7/site-packages/django/core/management/", line 323, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/nix/store/d3j918sarybg6h011bqsf6wk9gz351xh-python3-3.7.6-env/lib/python3.7/site-packages/django/core/management/", line 364, in execute
    output = self.handle(*args, **options)
  File "/nix/store/d3j918sarybg6h011bqsf6wk9gz351xh-python3-3.7.6-env/lib/python3.7/site-packages/django_extensions/management/", line 62, in inner
    ret = func(self, *args, **kwargs)
  File "/nix/store/d3j918sarybg6h011bqsf6wk9gz351xh-python3-3.7.6-env/lib/python3.7/site-packages/django_extensions/management/commands/", line 262, in handle
  File "/nix/store/d3j918sarybg6h011bqsf6wk9gz351xh-python3-3.7.6-env/lib/python3.7/site-packages/django_extensions/management/commands/", line 388, in inner_run
  File "/nix/store/d3j918sarybg6h011bqsf6wk9gz351xh-python3-3.7.6-env/lib/python3.7/site-packages/werkzeug/", line 988, in run_simple
PermissionError: [Errno 13] Permission denied

Where am I doing wrong?

It seems as if you are trying to bind port 80 in the container as a nonroot user.

This is usually not allowed.

The common way is to use a much higher port, 1025+, which do not require root or special permissions anymore, and then use dockers (or what ever runs the container) port-mapping.