performance: reduce docker image size

Dockerfile

@@ -1,21 +1,23 @@
-FROM node:18-alpine AS frontend-builder
+FROM node:18-slim AS frontend-builder
 WORKDIR /opt/app
 COPY frontend/package.json frontend/package-lock.json ./
 RUN npm ci
 COPY ./frontend .
 RUN npm run build
 
-FROM node:18 AS backend-builder
+FROM node:18-slim AS backend-builder
+RUN apt-get update && apt-get install -y openssl
 WORKDIR /opt/app
 COPY backend/package.json backend/package-lock.json ./
 RUN npm ci
 COPY ./backend .
 RUN npx prisma generate
 RUN npm run build
 
-FROM node:18 AS runner
-WORKDIR /opt/app/frontend
+FROM node:18-slim AS runner
 ENV NODE_ENV=production
+RUN apt-get update && apt-get install -y openssl
+WORKDIR /opt/app/frontend
 COPY --from=frontend-builder /opt/app/next.config.js .
 COPY --from=frontend-builder /opt/app/public ./public
 COPY --from=frontend-builder /opt/app/.next ./.next
@@ -26,7 +28,7 @@ COPY --from=backend-builder /opt/app/node_modules ./node_modules
 COPY --from=backend-builder /opt/app/dist ./dist
 COPY --from=backend-builder /opt/app/prisma ./prisma
 COPY --from=backend-builder /opt/app/package.json ./
-WORKDIR /opt/app
 
+WORKDIR /opt/app
 EXPOSE 3000
 CMD cd frontend && node_modules/.bin/next start & cd backend && npm run prod