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ci(preview): branch-specific GitHub Pages preview for review app
Builds apps/review on every push to claude/** (and on manual dispatch), publishes the single-file HTML to gh-pages/branches/<slug>/. Each branch lives in its own subdir; a concurrency group cancels in-flight runs of the same ref so we don't race ourselves. The first run creates the gh-pages branch — switch Settings -> Pages -> Source to "Deploy from a branch" / gh-pages / root after this lands.
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‎.github/workflows/branch-preview.yml‎

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name: Branch Preview
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# Builds the review-editor in demo mode and publishes a static preview
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# under https://<owner>.github.io/<repo>/branches/<branch-slug>/.
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# Triggered on pushes to claude/** branches and on manual dispatch.
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on:
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push:
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branches:
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- 'claude/**'
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workflow_dispatch:
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permissions:
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contents: write
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concurrency:
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group: branch-preview-${{ github.ref }}
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cancel-in-progress: true
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jobs:
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preview:
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runs-on: ubuntu-latest
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steps:
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- name: Checkout source
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uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
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- name: Checkout gh-pages (if it exists)
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uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
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with:
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ref: gh-pages
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path: gh-pages
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continue-on-error: true
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- uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2.2.0
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with:
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bun-version: latest
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- name: Install dependencies
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run: bun install
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- name: Build review app
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run: bun run --cwd apps/review build
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- name: Stage preview into gh-pages
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run: |
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BRANCH_SLUG=$(echo '${{ github.ref_name }}' | tr '/' '-')
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echo "BRANCH_SLUG=$BRANCH_SLUG" >> "$GITHUB_ENV"
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mkdir -p gh-pages/branches/"$BRANCH_SLUG"
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cp apps/review/dist/index.html gh-pages/branches/"$BRANCH_SLUG"/index.html
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# Friendly root landing page if one doesn't exist yet.
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if [ ! -f gh-pages/index.html ]; then
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cat > gh-pages/index.html <<'HTML'
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<!doctype html>
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<html><head><meta charset="utf-8"><title>Plannotator branch previews</title>
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<style>body{font:14px/1.5 system-ui;max-width:40em;margin:3em auto;padding:0 1em;color:#222}</style>
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</head><body><h1>Plannotator branch previews</h1>
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<p>Per-branch builds live under <code>/branches/&lt;branch-slug&gt;/</code>.</p>
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</body></html>
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HTML
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fi
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- name: Commit & push to gh-pages
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run: |
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cd gh-pages
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if [ ! -d .git ]; then
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git init -b gh-pages
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fi
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git config user.name "github-actions[bot]"
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git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
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git add -A
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if git diff --cached --quiet; then
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echo "No changes to deploy"
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exit 0
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fi
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git commit -m "preview: ${{ github.ref_name }} (${{ github.sha }})"
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git push "https://x-access-token:${GH_TOKEN}@github.com/${{ github.repository }}.git" HEAD:gh-pages
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env:
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GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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- name: Print preview URL
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run: |
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REPO_NAME=$(echo '${{ github.repository }}' | cut -d/ -f2)
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URL="https://${{ github.repository_owner }}.github.io/$REPO_NAME/branches/$BRANCH_SLUG/"
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echo "::notice title=Preview URL::$URL"
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echo "Preview: $URL" >> "$GITHUB_STEP_SUMMARY"

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