docs: Update example service (#129)

Author: chr1st1ank

examples/ml_prediction_service/Dockerfile

@@ -4,13 +4,17 @@
 #   docker run -it --rm -p 8000:8000 prediction-example
 # Test:
 #   curl 'localhost:8000/predict?number=10'
-# Load test with github.com/codesenberg/bombardier:
-#   bombardier -c 25 -r 300 -d 10s -l 'localhost:8000/predict?number=5'
+#
+# Simple load test with https://github.com/hatoo/oha:
+#   oha -c 25 -q 300 -n 2000  'http://localhost:8000/predict?number=5'
 
-FROM tiangolo/uvicorn-gunicorn-fastapi:python3.8
+FROM python:3.13-slim
 
-RUN pip install dike numpy
+RUN pip install --no-cache-dir dike numpy fastapi uvicorn
 COPY api.py /app/api.py
 
+USER 1000
 EXPOSE 8000
+WORKDIR /app
+
 CMD ["uvicorn", "api:app", "--host", "0.0.0.0", "--port", "8000"]