add: docker file and docker ignore

.dockerignore

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+.next/
+node_modules/
+.env.example

Dockerfile

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+FROM node:18-alpine AS deps
+RUN apk add --no-cache libc6-compat
+WORKDIR /app
+COPY .npmrc package.json yarn.lock* package-lock.json* pnpm-lock.yaml* ./
+RUN \
+    if [ -f yarn.lock ]; then yarn --frozen-lockfile; \
+    elif [ -f package-lock.json ]; then npm ci; \
+    elif [ -f pnpm-lock.yaml ]; then yarn global add pnpm && pnpm i; \
+    else echo "Lockfile not found." && exit 1; \
+    fi
+
+FROM node:18-alpine AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+ENV NEXT_TELEMETRY_DISABLED 1
+
+RUN npm run build
+
+FROM node:18-alpine AS runner
+WORKDIR /app
+
+ENV NODE_ENV production
+ENV NEXT_TELEMETRY_DISABLED 1
+
+RUN addgroup --system --gid 1001 nodejs
+RUN adduser --system --uid 1001 nextjs
+
+COPY --from=builder /app/next.config.js ./
+COPY --from=builder /app/sentry.properties ./
+COPY --from=builder /app/.sentryclirc ./
+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
+
+ENV PORT 3000
+
+CMD ["node", "server.js"]