Add Dockerfile for Next.js SPA deployment

nextjs/spa/Dockerfile

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+FROM node:22-alpine AS base
+
+# ========================================
+# Dependencies Stage
+# ========================================
+FROM base AS deps
+RUN apk add --no-cache libc6-compat python3 make g++ git
+WORKDIR /app
+
+COPY package.json yarn.lock ./
+
+RUN yarn install --frozen-lockfile --network-timeout 600000 || \
+  (yarn cache clean && yarn install --frozen-lockfile --network-timeout 600000)
+
+# ========================================
+# Builder Stage
+# ========================================
+FROM base AS builder
+WORKDIR /app
+
+COPY --from=deps /app/node_modules ./node_modules
+
+COPY . .
+
+ARG COOLIFY_URL
+ENV NEXT_PUBLIC_BASE_URL=${COOLIFY_URL}
+
+ENV NEXT_TELEMETRY_DISABLED=1
+ENV NEXT_PRIVATE_STANDALONE=true
+
+RUN yarn build
+
+# ========================================
+# Runner Stage
+# ========================================
+FROM base AS runner
+WORKDIR /app
+
+RUN apk add --no-cache libc6-compat curl
+
+RUN addgroup -g 1001 -S nodejs && \
+  adduser -S nextjs -u 1001
+
+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"]