Add Docker deployment workflow and Dockerfile for website

.github/workflows/docker.yml

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+name: Docker website
+on:
+  push:
+    branches:
+      - gh-pages
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  build_docker:
+    name: Docker
+    runs-on: ubuntu-latest
+    needs: build
+    permissions:
+      pages: write  # Required to deploy to GitHub Pages.
+      id-token: write  # Required to verify that the deployment originates from this workflow.
+
+    steps:
+
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          branch: gh-pages
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: xhofe/alist-docs
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to DockerHub
+        if: github.event_name == 'push'
+        uses: docker/login-action@v3
+        with:
+          username: xhofe
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: Dockerfile
+          push: ${{ github.event_name == 'push' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64,linux/arm64,linux/arm/v7

docs/.vuepress/public/Dockerfile

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+FROM halverneus/static-file-server:latest
+
+# Copy your static files
+COPY . /web