main-site/Dockerfile

## INIT STEP
# Install dependencies only when needed
FROM node:18-alpine AS deps

RUN apk add --no-cache libc6-compat
WORKDIR /app

# Copy the files needed to install deps
COPY package.json yarn.lock ./
RUN yarn install --frozen-lockfile

## BUILD STEP
# Rebuild the source code only when needed
FROM node:18-alpine AS builder

WORKDIR /app

# Copy node_modules installed by the deps step
COPY --from=deps /app/node_modules ./node_modules

COPY . .

RUN yarn build

## RUN STEP
FROM node:18-alpine AS runner

LABEL author="neshura@proton.me"
WORKDIR /usr/src/app

ENV NODE_ENV production

COPY --from=builder /app/public ./public
COPY --from=builder /app/node_modules ./node_modules

# Automatically leverage output traces to reduce image size
# https://nextjs.org/docs/advanced-features/output-file-tracing
COPY --from=builder /app/.next/standalone ./
COPY --from=builder /app/.next/static ./.next/static

# expose port 3000
ENV PORT 3000
EXPOSE 3000

CMD [ "yarn", "start" ]