Add client dockerfile and cd workflow

.github/workflows/clients.cd.yml

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+name: Clients CD
+on:
+  workflow_dispatch:
+  # schedule:
+  #   - cron:  '38 19 * * *' # run the cron job every day at 19.38
+  # push:
+  #   branches:
+  #     - "main"
+  #   tags-ignore:
+  #     - "**"
+  #   paths:
+  #     - "clients/**"
+  #     - ".github/workflows/**"
+  #     - ".github/actions/**"
+env:
+  REGISTRY: ghcr.io
+jobs:
+  build-and-push-blackjack-frontend:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/sahinakkaya/blackjack-frontend
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: client
+          file: client/Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

client/Dockerfile

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+# Use the official Node.js image with Alpine Linux
+FROM node:20-alpine
+
+# Set the working directory in the container
+WORKDIR /app
+
+# Copy package.json and yarn.lock to the working directory
+COPY package.json yarn.lock ./
+
+# Install dependencies using Yarn
+RUN yarn install --frozen-lockfile
+
+# Copy the rest of the application code
+COPY . .
+
+# Build the application for production
+RUN yarn build
+
+# Expose the port the app runs on (optional)
+EXPOSE 3000
+
+# Define the command to run the app
+CMD ["yarn", "start"]