Add Dockerfile again

Dockerfile

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+## 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 /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" ]