added gunicorn for prod deployment

Author: akhil27051999

app/Dockerfile

@@ -1,18 +1,35 @@
-# Stage 1: Build dependencies
+# Stage 1: Build Python dependencies
 FROM python:3.10-alpine AS build
-COPY requirements.txt .
+WORKDIR /api/app
+
+# Install build dependencies for psycopg2
+RUN apk add --no-cache gcc musl-dev postgresql-dev
+
+# Copy requirements and install dependencies
+COPY requirements.txt ./
 RUN pip install --user --no-cache-dir -r requirements.txt \
-  && find /root/.local -name '*.pyc' -delete \
-  && find /root/.local -name '__pycache__' -delete
+    && find /root/.local -name '*.pyc' -delete \
+    && find /root/.local -name '__pycache__' -delete
 
-# Stage 2: Main app
+# Stage 2: Main application image
 FROM python:3.10-alpine AS main
-WORKDIR /app
+WORKDIR /api
+
+# Install PostgreSQL client for pg_isready
+RUN apk add --no-cache postgresql-client
+
+# Copy installed Python packages from build stage
 COPY --from=build /root/.local /root/.local
-COPY . .
+
+# Copy the entire app folder
+COPY . ./app
+
+# Add pip binaries to PATH
 ENV PATH=/root/.local/bin:$PATH
-ENV FLASK_APP=wsgi.py
+ENV FLASK_APP=app/wsgi.py
+
+# Expose port
 EXPOSE 5000
 
-# Use Gunicorn instead of Flask dev server
-CMD ["gunicorn", "--bind", "0.0.0.0:5000", "wsgi:app", "--workers", "2"]
+# Start Gunicorn server
+CMD ["gunicorn", "--bind", "0.0.0.0:5000", "app.wsgi:app", "--workers", "2"]