Adds Kubernetes sandbox provisioner support (#35)

* Adds Kubernetes sandbox provisioner support

* Improves Docker dev setup by standardizing host paths

Replaces hardcoded host paths with a configurable root directory,
making the development environment more portable and easier to use
across different machines. Automatically sets the root path if not
already defined, reducing manual setup steps.

docker/provisioner/Dockerfile

@@ -0,0 +1,19 @@
+FROM python:3.12-slim
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install Python dependencies
+RUN pip install --no-cache-dir \
+    fastapi \
+    "uvicorn[standard]" \
+    kubernetes
+
+WORKDIR /app
+COPY app.py .
+
+EXPOSE 8002
+
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "8002"]