Dockerfile.arena

# TRINITY ARENA — LLM Battle Platform
# Pure Zig HTTP server with ELO leaderboard
# Deploy: docker build -f deploy/Dockerfile.arena -t arena . && docker run -p 8080:8080 arena

# Build stage: compile arena binary with Zig 0.15.2
FROM debian:bookworm-slim AS build

RUN apt-get update && apt-get install -y --no-install-recommends \
    ca-certificates curl xz-utils \
    && rm -rf /var/lib/apt/lists/*

# Install Zig 0.15.2
RUN curl -L https://ziglang.org/download/0.15.2/zig-linux-x86_64-0.15.2.tar.xz \
    | tar -xJ -C /opt \
    && ln -s /opt/zig-linux-x86_64-0.15.2/zig /usr/local/bin/zig

WORKDIR /app
COPY build.zig build.zig.zon ./
COPY src/ src/
COPY tools/ tools/
COPY specs/ specs/
COPY generated/ generated/

# Build all binaries (arena needs modules from build.zig)
RUN zig build 2>&1 | tail -20; \
    test -f zig-out/bin/arena && echo "ARENA BUILD OK" || exit 1

# Runtime stage: minimal image
FROM debian:bookworm-slim

RUN apt-get update && apt-get install -y --no-install-recommends \
    ca-certificates \
    && rm -rf /var/lib/apt/lists/*

COPY --from=build /app/zig-out/bin/arena /usr/local/bin/arena

# Arena data directory (battle results, leaderboard)
RUN mkdir -p /data/arena
WORKDIR /data

ENV ARENA_PORT=8080
EXPOSE 8080

# Pass API keys via env vars at runtime:
# -e OPENAI_API_KEY=... -e ANTHROPIC_API_KEY=... -e ZAI_KEY_1=...

ENTRYPOINT ["/usr/local/bin/arena", "serve"]