add docker specifics

docker/acc-server/Dockerfile

@@ -0,0 +1,41 @@
+# ACC Server container: Wine + accServer.exe
+# Game files are mounted read-only from the shared acc-game volume.
+# Per-server config files are mounted read-write from the manager's config volume.
+FROM debian:bookworm-slim
+
+# Install Wine, Xvfb (headless display for Wine), and minimal runtime deps.
+RUN dpkg --add-architecture i386 && \
+    apt-get update && \
+    apt-get install -y --no-install-recommends \
+        wine \
+        wine32 \
+        wine64 \
+        xvfb \
+        ca-certificates \
+        && \
+    rm -rf /var/lib/apt/lists/*
+
+# Create a non-root user for running the server.
+RUN useradd -ms /bin/bash accserver
+
+WORKDIR /home/accserver
+
+# Copy entrypoint script.
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+# Volumes (bind-mounted by DockerRuntime.Create):
+#   /acc/game  — shared game files, mounted read-only (ACC_GAME_VOLUME)
+#   /acc/cfg   — per-server config dir, mounted read-write (server.GetConfigPath())
+VOLUME ["/acc/game", "/acc/cfg"]
+
+# Default server port — overridden at runtime via SERVER_PORT env var.
+ENV SERVER_PORT=9600
+ENV WINEDEBUG=-all
+ENV DISPLAY=:99
+
+EXPOSE ${SERVER_PORT}/tcp
+EXPOSE ${SERVER_PORT}/udp
+
+USER accserver
+ENTRYPOINT ["/entrypoint.sh"]