feat: use Docker in production (#12)

* build: add experimental feature outputStandalone

With this option, Next.js can create a standalone folder with the
necessary files for a production deployment. It will be useful for
Docker deployment.

* chore: add Docker configuration

* docs: update README with Docker instructions

1 files changed, 54 insertions, 0 deletions

diff --git a/Dockerfile b/Dockerfile
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index 0000000..ce1176a
--- /dev/null
+++ b/Dockerfile
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+# Install dependencies only when needed
+FROM node:16-alpine AS deps
+# Check https://github.com/nodejs/docker-node/tree/b4117f9333da4138b03a546ec926ef50a31506c3#nodealpine to understand why libc6-compat might be needed.
+RUN apk add --no-cache libc6-compat
+WORKDIR /app
+COPY package.json yarn.lock ./
+RUN yarn install --frozen-lockfile
+
+# If using npm with a `package-lock.json` comment out above and use below instead
+# COPY package.json package-lock.json ./
+# RUN npm ci
+
+# Rebuild the source code only when needed
+FROM node:16-alpine AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+
+# Next.js collects completely anonymous telemetry data about general usage.
+# Learn more here: https://nextjs.org/telemetry
+# Uncomment the following line in case you want to disable telemetry during the build.
+# ENV NEXT_TELEMETRY_DISABLED 1
+
+RUN yarn build
+
+# Production image, copy all the files and run next
+FROM node:16-alpine AS runner
+WORKDIR /app
+
+ENV NODE_ENV production
+# Uncomment the following line in case you want to disable telemetry during runtime.
+# ENV NEXT_TELEMETRY_DISABLED 1
+
+RUN addgroup --system --gid 1001 nodejs
+RUN adduser --system --uid 1001 nextjs
+
+# You only need to copy next.config.js if you are NOT using the default configuration
+# COPY --from=builder /app/next.config.js ./
+COPY --from=builder /app/public ./public
+COPY --from=builder /app/package.json ./package.json
+
+# Automatically leverage output traces to reduce image size
+# https://nextjs.org/docs/advanced-features/output-file-tracing
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+
+USER nextjs
+
+ARG DOCKER_PORT=3000
+EXPOSE ${DOCKER_PORT}
+
+ENV PORT ${DOCKER_PORT}
+
+CMD ["node", "server.js"]