fix: fixed security concern

Dockerfile

@@ -1,5 +1,8 @@
 FROM python:3.12-slim
-ARG VERSION=unkown
+ARG VERSION=unknown
+
+# Create a non-root user
+RUN useradd appuser
 
 WORKDIR /app
 COPY . .
@@ -11,15 +14,20 @@ ENV VERSION=${VERSION}
 
 # Install dependencies
 RUN pip install --no-cache-dir --upgrade -r requirements.txt
-RUN pip install 'uvicorn[standard]'
 
 ENV ENV=DEV
 
+# Switch to non-root user
+USER appuser
+
 EXPOSE 8000
 CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]
 
 # Install curl
-RUN apt-get update && apt-get install -y curl && apt-get clean
+USER root
+RUN apt-get update && apt-get install --no-install-recommends -y curl && apt-get clean
 
+# Switch back to non-root user for healthcheck
+USER appuser
 HEALTHCHECK --interval=30s --timeout=10s --retries=5 \
   CMD curl --fail http://localhost:8000/openapi.json || exit 1