feat: Add Docker workflows for building, testing, and deploying the application; include Dockerfile for image creation

Dockerfile

@@ -0,0 +1,31 @@
+# Multi-stage Dockerfile to keep final image small
+FROM python:3.10-slim AS builder
+
+# Install build-time packages and Python dependencies in one layer
+WORKDIR /app
+COPY requirements.txt /app/requirements.txt
+RUN apt-get update \
+	&& apt-get install -y --no-install-recommends build-essential gcc libpq-dev \
+	&& python -m pip install --upgrade pip \
+	&& pip install --no-cache-dir --prefix=/install -r /app/requirements.txt \
+	&& apt-get purge -y --auto-remove build-essential gcc \
+	&& rm -rf /var/lib/apt/lists/*
+
+FROM python:3.10-slim
+WORKDIR /app
+
+# Copy installed packages from builder
+COPY --from=builder /install /usr/local
+
+# Production environment variables
+ENV PYTHONDONTWRITEBYTECODE=1 \
+	PYTHONUNBUFFERED=1
+
+# Copy application code
+COPY . /app
+
+# Expose service port
+EXPOSE 8000
+
+# Run the FastAPI app with uvicorn
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]