Fixed docker start up issue

Dockerfile

@@ -0,0 +1,31 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+# Install dependencies
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application code
+COPY . .
+
+# Set environment variables
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PORT=8080
+
+# Create non-root user for security
+RUN adduser --disabled-password --gecos "" appuser && \
+    chown -R appuser:appuser /app
+
+USER appuser
+
+# Expose port
+EXPOSE 8080
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+  CMD curl -f http://localhost:8080/v1/api/salary/health || exit 1
+
+# Run the application with Gunicorn - use wsgi.py instead
+CMD ["gunicorn", "--bind", "0.0.0.0:8080", "--workers", "4", "wsgi:create_app()"]