Use lighter base images for frontend containers

Switched Node.js and Nginx images from 'bookworm' to 'alpine' variants to reduce image size. Added `apk upgrade --no-cache` for updated Alpine packages in the Nginx container. This optimizes resource usage and enhances performance.

frontend/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:22-bookworm-slim AS build
+FROM node:22-alpine AS build
 WORKDIR /app
 COPY package.json package-lock.json* ./
 RUN npm install
@@ -7,7 +7,8 @@ ARG VITE_API_URL=/api/v1
 ENV VITE_API_URL=${VITE_API_URL}
 RUN npm run build
 
-FROM nginx:1.29-bookworm
+FROM nginx:1.29-alpine-slim
+RUN apk upgrade --no-cache
 COPY nginx.conf /etc/nginx/conf.d/default.conf
 COPY --from=build /app/dist /usr/share/nginx/html
 EXPOSE 80