added deploy workflow & dockerfile for both frontend and backend

.github/workflows/deploy.yml

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+name: Build and Deploy to Docker Hub
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check Out Repo
+        uses: actions/checkout@v4 # Updated to v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3 # Added for better build performance
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v3 # Updated to v3
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Build and Push Backend Docker image
+        uses: docker/build-push-action@v5 # Updated to v5
+        with:
+          context: .
+          file: ./Dockerfile.backend
+          push: true
+          tags: puneetnj/course-app-be:latest
+          cache-from: type=registry,ref=puneetnj/course-app-be:latest
+          cache-to: type=inline
+          build-args: |
+            DATABASE_URL=${{ secrets.DATABASE_URL }}
+            USER_JWT_PASSWORD=${{ secrets.USER_JWT_PASSWORD }}
+            ADMIN_JWT_PASSWORD=${{ secrets.ADMIN_JWT_PASSWORD }}
+            AWS_ACCESS_KEY_ID=${{ secrets.AWS_ACCESS_KEY_ID }}
+            AWS_SECRET_ACCESS_KEY=${{ secrets.AWS_SECRET_ACCESS_KEY }}
+            CDN_LINK=${{ secrets.CDN_LINK }}
+
+      - name: Build and Push Frontend Docker image
+        uses: docker/build-push-action@v5 # Updated to v5
+        with:
+          context: .
+          file: ./Dockerfile.frontend
+          push: true
+          tags: puneetnj/course-app-fe:latest
+          cache-from: type=registry,ref=puneetnj/course-app-fe:latest
+          cache-to: type=inline
+
+      - name: Verify Backend Image
+        run: |
+          docker pull puneetnj/course-app-be:latest
+          docker image inspect puneetnj/course-app-be:latest
+
+      - name: Verify Frontend Image
+        run: |
+          docker pull puneetnj/course-app-fe:latest
+          docker image inspect puneetnj/course-app-fe:latest

Dockerfile.backend

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+FROM node:18-bullseye
+
+WORKDIR /app/backend
+
+# Define build arguments
+ARG DATABASE_URL
+ARG USER_JWT_PASSWORD
+ARG ADMIN_JWT_PASSWORD
+ARG AWS_ACCESS_KEY_ID
+ARG AWS_SECRET_ACCESS_KEY
+ARG CDN_LINK
+
+# Set them as environment variables
+ENV DATABASE_URL=$DATABASE_URL
+ENV USER_JWT_PASSWORD=$USER_JWT_PASSWORD
+ENV ADMIN_JWT_PASSWORD=$ADMIN_JWT_PASSWORD
+ENV AWS_ACCESS_KEY_ID=$AWS_ACCESS_KEY_ID
+ENV AWS_SECRET_ACCESS_KEY=$AWS_SECRET_ACCESS_KEY
+ENV CDN_LINK=$CDN_LINK
+
+COPY ./backend/package*.json ./
+
+RUN npm install
+
+COPY ./backend ./
+
+RUN npx prisma generate
+
+EXPOSE 4000
+
+RUN npm run build
+
+CMD ["npm", "run", "start"]

Dockerfile.frontend

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+FROM node:18-alpine AS builder
+
+WORKDIR /app/frontend
+
+COPY ./frontend/package*.json ./
+
+RUN npm install
+
+COPY ./frontend .
+
+RUN npm run build
+
+# Production runtime
+FROM nginx:alpine AS production
+
+COPY --from=builder /app/frontend/dist /usr/share/nginx/html
+
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 5173
+
+CMD ["nginx", "-g", "daemon off;"]