working 3 tier approach

backend/Dockerfile

@@ -0,0 +1,12 @@
+FROM docker.io/library/python:3.12-slim AS base
+
+WORKDIR /app
+
+RUN pip install --no-cache-dir gunicorn uvicorn psycopg2-binary
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "2"]