feat: add runtime configuration manipulation

- `INJECT_MAX_UPLOAD_SIZE`: _int, default=10MB_ - Specifies the maximum body size of requests, including file uploads.

- `INJECT_REDICT_HOST`: _string, default=None_ - If set, enables Redict. Host address where Redict is running.

- `INJECT_REDICT_PORT`: _int, default=6379_ - Port where Redict is running.

- `INJECT_UPDATE_INTERVAL`: _int, default=10_ - Number of seconds that specifies the frequency at which automatic actions of exercise are checked and executed (minimum value is 2 seconds).

The lower the value, the more responsive the exercise may seem, but it requires higher performance.

- `INJECT_MAX_TEAMS`: _int, default=50_ - The number of maximum allowed teams in an exercise.

### Running the Application with Poetry:

from django.apps import AppConfig

from django.conf import settings

class CommonLibConfig(AppConfig):

    default_auto_field = "django.db.models.BigAutoField"

    name = "common_lib"

    def ready(self):

        if settings.TESTING_MODE:

            return

        from common_lib.models import PlatformConfig

        if not PlatformConfig.objects.exists():

            raise Exception(

                "Initial PlatformConfig not found. Please run the migrations to create the necessary database tables."

            )

from common_lib.models import PlatformConfig

from common_lib.schema.inputs import PlatformConfigInput

class PlatformConfigManager:

    @staticmethod

    def update_config(

        platform_config_input: PlatformConfigInput,

    ) -> PlatformConfig:

        config = PlatformConfigManager.get_config()

        max_teams = platform_config_input.max_teams

        update_interval = platform_config_input.update_interval

        if max_teams is not None:

            if max_teams < 1:

                raise ValueError("'max_teams' must be at least 1")

            config.max_teams = max_teams

        if update_interval is not None:

            if update_interval < 2:

                raise ValueError("'update_interval' must be at least 2 seconds")

            config.update_interval = update_interval

        config.save()

        return config

    @staticmethod

    def get_config() -> PlatformConfig:

        return PlatformConfig.objects.first()

# Generated by Django 3.2.25 on 2025-07-01 16:52

from django.db import migrations, models

class Migration(migrations.Migration):

    initial = True

    dependencies = [

    ]

    operations = [

        migrations.CreateModel(

            name='PlatformConfig',

            fields=[

                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),

                ('max_teams', models.IntegerField()),

                ('update_interval', models.IntegerField()),

            ],

        ),

        migrations.AddConstraint(

            model_name='platformconfig',

            constraint=models.CheckConstraint(check=models.Q(('max_teams__gte', 1)), name='max_teams_gte_1'),

        ),

        migrations.AddConstraint(

            model_name='platformconfig',

            constraint=models.CheckConstraint(check=models.Q(('update_interval__gte', 2)), name='update_interval_gte_2'),

        ),

    ]

# Generated by Django 3.2.25 on 2025-07-03 15:54

import os

from django.db import migrations

def create_platform_config(apps, schema_editor):

    PlatformConfig = apps.get_model('common_lib', 'PlatformConfig')

    PlatformConfig.objects.create(

        max_teams=int(os.environ.get("INJECT_MAX_TEAMS", 50)),

        update_interval=int(os.environ.get("INJECT_UPDATE_INTERVAL", 10))

    )

def reverse_create_platform_config(apps, schema_editor):

    PlatformConfig = apps.get_model('common_lib', 'PlatformConfig')

    PlatformConfig.objects.all().delete()

class Migration(migrations.Migration):

    dependencies = [

        ('common_lib', '0001_initial'),

    ]

    operations = [

        migrations.RunPython(create_platform_config, reverse_create_platform_config),

    ]