add github workflows for test, deploy, and pr previews.

Author: jifalops

.github/workflows/deploy.yml

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+# Deploy to GitHub Pages.
+#
+# Based on https://github.com/JamesIves/github-pages-deploy-action
+# and https://github.com/marketplace/actions/deploy-pr-preview#ensure-your-main-deployment-is-compatible
+
+name: Deploy
+on:
+  push:
+    branches:
+      - main
+permissions:
+  contents: write
+jobs:
+  build-and-deploy:
+    concurrency: ci-${{ github.ref }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout 🛎️
+        uses: actions/checkout@v4
+
+      - name: Install and Build 🔧
+        run: |
+          npm ci
+          npm run build
+          npm run obfuscate
+
+      - name: Deploy 🚀
+        uses: JamesIves/github-pages-deploy-action@v4
+        with:
+          folder: build
+          clean-exclude: pr-preview/
+          force: false

.github/workflows/preview.yml

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+# Preview PRs by deploying to a pemanent subdirectory in GitHub Pages.
+#
+# Based on https://github.com/marketplace/actions/deploy-pr-preview#usage.
+
+name: Deploy PR previews
+
+on:
+  pull_request:
+    branches:
+      - main
+    types:
+      - opened
+      - synchronize
+    paths:
+      - '**.js'
+      - '**.ts'
+      - '**.json'
+      - 'src/**'
+      - 'static/**'
+      - '.env'
+      - '.env.*'
+
+concurrency: preview-${{ github.ref }}
+
+jobs:
+  deploy-preview:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Install and Build
+        run: |
+          npm ci
+          npm run build
+          npm run obfuscate
+
+      - name: Deploy preview
+        uses: rossjrw/pr-preview-action@v1
+        with:
+          source-dir: ./build/
+          action: deploy

.github/workflows/test.yml

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+# Run unit and integration tests.
+#
+# Based on https://playwright.dev/docs/ci#via-containers.
+name: Test
+on:
+  push:
+    branches: main
+  pull_request:
+    branches: main
+jobs:
+  test:
+    name: 'Test'
+    runs-on: ubuntu-latest
+    container:
+      image: mcr.microsoft.com/playwright
+      options: --user 1001
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: lts/*
+      - name: Install dependencies
+        run: npm ci
+      - name: Run tests
+        run: npm run test
+      - uses: actions/upload-artifact@v4
+        if: ${{ !cancelled() }}
+        with:
+          name: playwright-report
+          path: playwright-report/
+          retention-days: 30