# ─────────────────────────────────────────────────────────────
# Sandbox Dockerfile — C++ execution
# ─────────────────────────────────────────────────────────────

FROM gcc:13-bookworm

# Create sandbox user
RUN useradd -m -u 1000 sandbox

# Create workspace
RUN mkdir -p /sandbox && chown sandbox:sandbox /sandbox

USER sandbox
WORKDIR /sandbox

ENTRYPOINT ["sh", "-c"]