[CHORES] add nginx to serve static files

docker-compose.yml

 version: '3.7'
 
 services:
+  nginx:
+    image: nginx:stable
+    restart: always
+    ports:
+      - ${BACKEND_PORT:-8000}:80
+    volumes:
+      - ./nginx/default.conf:/etc/nginx/conf.d/default.conf
+      - staticfiles:/var/www/html/static/
+    depends_on:
+      - backend
   backend:
     build:
       context: ./
@@ -8,8 +18,7 @@ services:
     command: gunicorn sizakat.wsgi --bind 0.0.0.0:8000 --log-file -
     volumes:
       - ./:/app/backend/
-    ports:
-      - ${BACKEND_PORT:-8000}:8000
+      - staticfiles:/app/backend/staticfiles/
     env_file:
       - .env
     depends_on:
@@ -24,3 +33,4 @@ services:
 
 volumes:
   postgres_data:
+  staticfiles:

entrypoint.sh

@@ -11,6 +11,7 @@ then
     echo "PostgreSQL started"
 fi
 
+python manage.py collectstatic --no-input
 python manage.py migrate
 
 exec "$@"

nginx/default.conf

+server {
+    listen 80;
+
+    location /static/ {
+        root /var/www/html/;
+    }
+
+    location / {
+        proxy_pass http://backend:8000;
+        proxy_set_header Host $http_host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+}