Initial commit: Excalidraw Rooms with per-user storage

Dockerfile

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+FROM golang:1.21-alpine AS builder
+
+WORKDIR /app
+COPY go.mod ./
+COPY main.go ./
+COPY static/ ./static/
+
+RUN go build -o excalidraw-library .
+
+FROM alpine:latest
+
+RUN apk --no-cache add ca-certificates
+
+WORKDIR /app
+COPY --from=builder /app/excalidraw-library .
+
+ENV DATA_DIR=/data
+ENV PORT=8080
+
+EXPOSE 8080
+
+CMD ["./excalidraw-library"]