feat: Add Dockerfile and .dockerignore for improved containerization

.dockerignore

@@ -0,0 +1,23 @@
+.git
+.gitignore
+**/__pycache__/
+*.py[cod]
+*.pyo
+*.pyd
+*.swp
+*.swo
+*.log
+.env
+venv/
+.venv/
+env/
+ENV/
+.build/
+build/
+dist/
+node_modules/
+__pycache__/
+.testresults/
+.pytest_cache/
+.coverage
+.mypy_cache/

Dockerfile

@@ -1,4 +1,19 @@
-FROM python:3.11-slim
+FROM python:3.11-alpine AS builder
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1
+
+WORKDIR /app
+
+RUN apk add --no-cache \
+    build-base \
+    libffi-dev \
+    openssl-dev
+
+COPY requirements.txt ./
+RUN pip install --no-cache-dir --prefix=/install -r requirements.txt
+
+FROM python:3.11-alpine AS runner
 
 ENV PYTHONDONTWRITEBYTECODE=1 \
     PYTHONUNBUFFERED=1 \
@@ -6,18 +21,19 @@ ENV PYTHONDONTWRITEBYTECODE=1 \
 
 WORKDIR /app
 
-# Install system dependencies required by Telethon and FastAPI
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    build-essential \
-    libffi-dev \
-    && rm -rf /var/lib/apt/lists/*
+RUN apk add --no-cache \
+    libffi \
+    libstdc++ \
+    openssl \
+  && adduser -D appuser
 
-COPY requirements.txt ./
-RUN pip install --no-cache-dir -r requirements.txt
+COPY --from=builder /install /usr/local
 
 COPY app ./app
 
-RUN mkdir -p data
+RUN mkdir -p data && chown -R appuser:appuser /app
+
+USER appuser
 
 EXPOSE 8000
 CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]