add uv package manager and use it to build container

Dockerfile

@@ -1,13 +1,13 @@
-FROM python:alpine
+FROM ghcr.io/astral-sh/uv:python3.13-trixie-slim
 
-RUN apk add --no-cache build-base
+# RUN apk add --no-cache build-base
 
 # Install app
 COPY . /app
 WORKDIR /app
 
 # Install dependencies
-RUN pip install --upgrade pip && pip install -r requirements.txt
+RUN uv sync --no-config --frozen --compile-bytecode
 
 # Run Battlesnake
-CMD [ "python", "main.py" ]
+CMD ["uv", "run", "main.py"]