Add CI/CD workflows for build check and Docker builds

.github/workflows/build-check.yml

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+name: Build Check
+on:
+  pull_request:
+    branches:
+      - main
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - name: Install
+        run: npm ci
+
+      - name: Build
+        run: npm run build

.github/workflows/docker-build-master.yml

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+name: Docker Build and Push to DockerHub (main)
+env:
+  DOCKER_CLI_EXPERIMENTAL: enabled
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: Build and push graphmindset image
+    env:
+      ACTIONS_ALLOW_UNSECURE_COMMANDS: true
+    steps:
+      - name: Check out from Git
+        uses: actions/checkout@v4
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+        id: buildx
+      - name: Cache Docker layers
+        uses: actions/cache@v4
+        id: cache
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+      - name: Run Docker buildx
+        run: |
+          docker buildx build \
+          --cache-to "type=local,dest=/tmp/.buildx-cache" \
+          --platform linux/amd64 \
+          --tag "${{ secrets.DOCKER_HUB_USER }}/graphmindset:master" \
+          --output "type=registry" ./

.github/workflows/docker-build.yml

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+name: Docker Build and Push to DockerHub
+env:
+  DOCKER_CLI_EXPERIMENTAL: enabled
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  push:
+    strategy:
+      matrix:
+        include:
+          - platform: linux/amd64
+            runner: ubuntu-latest
+          - platform: linux/arm64
+            runner: ubuntu-arm64
+    runs-on: ${{ matrix.runner }}
+    name: Build and push graphmindset image
+    env:
+      ACTIONS_ALLOW_UNSECURE_COMMANDS: true
+    steps:
+      - name: Check out from Git
+        uses: actions/checkout@v4
+      - name: Set release tag
+        run: echo "RELEASE_TAG=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+        id: buildx
+      - name: Show available buildx platforms
+        run: echo ${{ steps.buildx.outputs.platforms }}
+      - name: Cache Docker layers
+        uses: actions/cache@v4
+        id: cache
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}-${{ matrix.platform }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-${{ matrix.platform }}-
+      - name: Run Docker buildx
+        run: |
+          PLATFORM_TAG=$(echo ${{ matrix.platform }} | tr '/' '-')
+          docker buildx build \
+          --platform ${{ matrix.platform }} \
+          --tag "${{ secrets.DOCKER_HUB_USER }}/graphmindset:${{ env.RELEASE_TAG }}-${PLATFORM_TAG}" \
+          --cache-from "type=registry,ref=${{ secrets.DOCKER_HUB_USER }}/graphmindset:cache-${PLATFORM_TAG}" \
+          --cache-to "type=registry,image-manifest=true,oci-mediatypes=true,mode=max,ref=${{ secrets.DOCKER_HUB_USER }}/graphmindset:cache-${PLATFORM_TAG}" \
+          --output "type=registry" ./
+
+  create-manifest:
+    runs-on: ubuntu-latest
+    needs: push
+    name: Create multi-platform manifest
+    steps:
+      - name: Check out from Git
+        uses: actions/checkout@v4
+      - name: Set release tag
+        run: echo "RELEASE_TAG=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Create and push multi-platform manifest
+        run: |
+          docker buildx imagetools create \
+            --tag "${{ secrets.DOCKER_HUB_USER }}/graphmindset:${{ env.RELEASE_TAG }}" \
+            --tag "${{ secrets.DOCKER_HUB_USER }}/graphmindset:latest" \
+            "${{ secrets.DOCKER_HUB_USER }}/graphmindset:${{ env.RELEASE_TAG }}-linux-amd64" \
+            "${{ secrets.DOCKER_HUB_USER }}/graphmindset:${{ env.RELEASE_TAG }}-linux-arm64"