feat: add Docker publishing via GitHub Actions

frontend/Dockerfile

@@ -1,19 +1,38 @@
-FROM node:18-alpine
+FROM node:18-alpine AS base
 
+FROM base AS deps
+RUN apk add --no-cache libc6-compat
 WORKDIR /app
-
-# Install dependencies
 COPY package*.json ./
-RUN npm install
+RUN npm ci
 
-# Copy source code
+FROM base AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
 COPY . .
+ENV NEXT_TELEMETRY_DISABLED 1
+RUN npm run build
 
-# Expose port
-EXPOSE 3000
-
-# Next.js telemetry disable
+FROM base AS runner
+WORKDIR /app
+ENV NODE_ENV production
 ENV NEXT_TELEMETRY_DISABLED 1
 
-# Start development server
-CMD ["npm", "run", "dev:frontend"]
+RUN addgroup --system --gid 1001 nodejs
+RUN adduser --system --uid 1001 nextjs
+
+COPY --from=builder /app/public ./public
+
+RUN mkdir .next
+RUN chown nextjs:nodejs .next
+
+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
+ENV HOSTNAME "0.0.0.0"
+
+CMD ["node", "server.js"]