chore: import upstream snapshot with attribution

examples/Dockerfile-example

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+# This is an example Dockerfile that builds a minimal container for running LK Agents
+# syntax=docker/dockerfile:1
+ARG PYTHON_VERSION=3.11.6
+FROM python:${PYTHON_VERSION}-slim
+
+# Prevents Python from writing pyc files.
+ENV PYTHONDONTWRITEBYTECODE=1
+
+# Keeps Python from buffering stdout and stderr to avoid situations where
+# the application crashes without emitting any logs due to buffering.
+ENV PYTHONUNBUFFERED=1
+
+# Create a non-privileged user that the app will run under.
+# See https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#user
+ARG UID=10001
+RUN adduser \
+    --disabled-password \
+    --gecos "" \
+    --home "/home/appuser" \
+    --shell "/sbin/nologin" \
+    --uid "${UID}" \
+    appuser
+
+# Install gcc, g++ and other build dependencies.
+RUN apt-get update && \
+    apt-get install -y \
+    gcc \
+    g++ \
+    python3-dev \
+    libglib2.0-0 \
+    && rm -rf /var/lib/apt/lists/*
+
+USER appuser
+
+RUN mkdir -p /home/appuser/.cache
+RUN chown -R appuser /home/appuser/.cache
+
+WORKDIR /home/appuser
+
+COPY requirements.txt .
+RUN python -m pip install --user --no-cache-dir -r requirements.txt
+
+# ensure that any dependent models are downloaded at build-time
+RUN python -m livekit.agents download-files
+
+COPY . .
+
+# Run the application.
+ENTRYPOINT ["python", "myagent.py"]
+CMD ["start"]