build: add github actions to publish demo to github pages

Author: BePo65

.github/dependabot.yml

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+version: 2
+updates:
+- package-ecosystem: npm
+  directory: "/"
+  schedule:
+    interval: monthly
+  open-pull-requests-limit: 10

.github/workflows/node.js.yml

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+# This workflow will do a clean installation of node dependencies, cache/restore them, build the source code and run tests across different versions of node
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-nodejs
+
+name: Node.js CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+
+    strategy:
+      matrix:
+        node-version: [18.x, 20.x, 21.x]
+        # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
+
+    steps:
+    - name: Check out
+      uses: actions/checkout@v3
+
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v3
+      with:
+        node-version: ${{ matrix.node-version }}
+        cache: 'npm'
+
+    - run: npm ci
+    - run: npm run build --if-present
+    - run: npm run lint
+    - run: npm test

.github/workflows/publish-demo.yml

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+name: publish-demo-to-github-pages
+
+on:
+  push:
+    branches: [ "main" ]
+  workflow_dispatch:
+
+jobs:
+  publish:
+    runs-on: ubuntu-22.04
+
+    strategy:
+      matrix:
+        node-version: [20.x]
+
+    steps:
+      - name: Check out
+        uses: actions/checkout@v3
+
+      - name: Use Node ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: 'npm'
+
+      - name: npm ci and npm run build
+        run: |
+          npm ci
+          npm run build:ghpages
+
+      - name: Publish current workdir (which contains generated content) to GitHub Pages
+        uses: rayluo/[email protected]
+        with:
+          # Optional. Default value "." means the root directory of your project will be published.
+          # You can use whatever directory your project uses, for example "wwwroot".
+          # Such a directory does *not* have to already exist in your repo,
+          # it could be an output directory created dynamically by your static website builder.
+          source-directory: ghpages
+
+          # Optional. Default value "gh_pages".
+          # It specifies the temporary branch which hosts the static website.
+          # Each build will OVERWRITE this branch.
+          target-branch: gh_pages