Add Docker stuff

Dockerfile

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+## syntax=docker/dockerfile:1.7
+
+# ---- deps ----
+FROM node:22-alpine AS deps
+RUN apk add --no-cache libc6-compat
+WORKDIR /app
+COPY package.json package-lock.json* ./
+RUN npm ci --no-audit --no-fund
+
+# ---- build ----
+FROM node:22-alpine AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+ENV NEXT_TELEMETRY_DISABLED=1
+RUN npm run build
+
+# ---- runner ----
+FROM node:22-alpine AS runner
+WORKDIR /app
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+ENV PORT=3000
+ENV HOSTNAME=0.0.0.0
+
+RUN addgroup --system --gid 1001 nodejs \
+ && adduser --system --uid 1001 nextjs
+
+# Standalone output copies only what's needed at runtime.
+COPY --from=builder /app/public ./public
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+
+USER nextjs
+EXPOSE 3000
+
+CMD ["node", "server.js"]