lab-2: add dockerfile for backend and nginx

lab-2/local/backend/Dockerfile

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+FROM python:3.12-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .

lab-2/local/nginx/Dockerfile

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+FROM nginx:latest
+
+COPY templates /etc/nginx/templates/

lab-2/local/nginx/templates/default.conf.template

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+server {
+    listen 80;
+
+    resolver 127.0.0.11 valid=30s;
+
+    location /static/ {
+        alias /staticfiles/;
+    }
+
+    location /admin/ {
+        set $backend backend_service;
+        proxy_pass http://$backend:8000$request_uri;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_redirect off;
+    }
+
+    location /api/ {
+        set $backend backend_service;
+        proxy_pass http://$backend:8000$request_uri;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_redirect off;
+    }
+}