Add Dockerfile

Dockerfile

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+# ─────────────────────────────────────────────
+# Stage 1: Build the React frontend
+# ─────────────────────────────────────────────
+FROM node:20-alpine AS ui-builder
+
+WORKDIR /app
+
+# Install dependencies first (better layer caching)
+COPY package.json package-lock.json* ./
+RUN npm ci
+
+# Copy source and build
+COPY index.html vite.config.ts tsconfig.json tsconfig.node.json tailwind.config.js postcss.config.js* ./
+COPY src ./src
+RUN npm run build
+# Output lands in backend/cmd/moonrelay/ui/ (per vite.config.ts)
+
+
+# ─────────────────────────────────────────────
+# Stage 2: Build the Go backend
+# ─────────────────────────────────────────────
+FROM golang:1.22-alpine AS go-builder
+
+WORKDIR /app
+
+# System deps for tsnet (WireGuard needs these on Linux)
+RUN apk add --no-cache git
+
+COPY backend/go.mod backend/go.sum ./backend/
+RUN cd backend && go mod download
+
+# Copy all Go source
+COPY backend ./backend
+
+# Copy the compiled React SPA into the go:embed target directory
+COPY --from=ui-builder /app/backend/cmd/moonrelay/ui ./backend/cmd/moonrelay/ui
+
+# Build a static binary
+RUN cd backend && CGO_ENABLED=0 GOOS=linux go build \
+    -ldflags="-s -w" \
+    -o /moonrelay \
+    ./cmd/moonrelay
+
+
+# ─────────────────────────────────────────────
+# Stage 3: Minimal runtime image
+# ─────────────────────────────────────────────
+FROM alpine:3.19
+
+# ca-certificates needed for Tailscale TLS
+RUN apk add --no-cache ca-certificates tzdata
+
+# Create a non-root user
+RUN addgroup -S moonrelay && adduser -S moonrelay -G moonrelay
+
+# Persistent state directory (mount a volume here)
+RUN mkdir -p /data && chown moonrelay:moonrelay /data
+
+COPY --from=go-builder /moonrelay /usr/local/bin/moonrelay
+
+USER moonrelay
+
+# Web UI port
+EXPOSE 8080
+
+# Tailscale state lives here — mount a named volume for persistence
+ENV TS_STATE_DIR=/data/tsnet
+ENV MOONRELAY_PORT=8080
+ENV MOONRELAY_HOST=0.0.0.0
+
+ENTRYPOINT ["/usr/local/bin/moonrelay"]