Create Dockerfile

Dockerfile

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+# --- build stage -------------------------------------------------------------
+FROM node:20-bullseye-slim AS builder
+
+ARG EXCALIDRAW_REPO=https://github.com/excalidraw/excalidraw.git
+ARG EXCALIDRAW_ROOM_REPO=https://github.com/excalidraw/excalidraw-room.git
+ARG EXCALIDRAW_STORAGE_REPO=https://github.com/excalidraw/excalidraw-storage-backend.git
+
+# URLs the client has to call once deployed
+ENV REACT_APP_WS_SERVER_URL=/room
+ENV REACT_APP_HTTP_STORAGE_BACKEND_URL=/api
+
+RUN apt-get update -y \
+ && apt-get install -y git
+
+# --- clone & build the React client -----------------------------------------
+RUN git clone --depth 1 $EXCALIDRAW_REPO /opt/excalidraw
+WORKDIR /opt/excalidraw
+RUN corepack enable && yarn --frozen-lockfile
+RUN yarn build                                   \
+    --mode=production                            \
+    --env REACT_APP_WS_SERVER_URL=$REACT_APP_WS_SERVER_URL \
+    --env REACT_APP_HTTP_STORAGE_BACKEND_URL=$REACT_APP_HTTP_STORAGE_BACKEND_URL
+
+# --- clone servers (no build step needed) ------------------------------------
+RUN git clone --depth 1 $EXCALIDRAW_ROOM_REPO     /opt/room
+RUN git clone --depth 1 $EXCALIDRAW_STORAGE_REPO  /opt/storage
+
+WORKDIR /opt/room
+RUN yarn --production
+WORKDIR /opt/storage
+RUN yarn --production
+
+# --- runtime stage -----------------------------------------------------------
+FROM node:20-bullseye-slim
+
+ENV PORT=7860
+ENV ROOM_PORT=5001
+ENV STORAGE_PORT=5002
+ENV REDIS_PORT=6379
+
+# install nginx, redis & supervisor
+RUN apt-get update -y                                             \
+ && apt-get install -y nginx redis-server supervisor              \
+ && rm -rf /var/lib/apt/lists/*                                   \
+ && mkdir -p /var/log/supervisor
+
+# copy artifacts from builder
+COPY --from=builder /opt /opt
+
+# nginx routing: / → client, /room → WS server, /api → storage
+COPY nginx.conf /etc/nginx/conf.d/excalidraw.conf
+
+# supervisor keeps every service alive
+COPY supervisord.conf /etc/supervisor/conf.d/supervisord.conf
+
+EXPOSE ${PORT}
+CMD ["/usr/bin/supervisord","-n"]