switch db to postgres

app/tmt_learning/settings.py

 """
 
 from pathlib import Path
+import os
+import environ
 
 # Build paths inside the project like this: BASE_DIR / 'subdir'.
 BASE_DIR = Path(__file__).resolve().parent.parent
 
+env = environ.Env()
+environ.Env.read_env()
+
 
 # Quick-start development settings - unsuitable for production
 # See https://docs.djangoproject.com/en/4.1/howto/deployment/checklist/
 # SECURITY WARNING: don't run with debug turned on in production!
 DEBUG = True
 
-ALLOWED_HOSTS = []
+ALLOWED_HOSTS = ['*']
 
 
 # Application definition
 
 DATABASES = {
     'default': {
-        'ENGINE': 'django.db.backends.sqlite3',
-        'NAME': BASE_DIR / 'db.sqlite3',
+        'ENGINE': 'django.db.backends.postgresql_psycopg2',
+        'NAME': env("POSTGRES_NAME"),
+        'USER': env("POSTGRES_USER"),
+        'PASSWORD': env("POSTGRES_PASSWORD"),
+        'HOST': 'db',
+        'PORT': '5432',
     }
 }
 
 
+
 # Password validation
 # https://docs.djangoproject.com/en/4.1/ref/settings/#auth-password-validators