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.github/workflows/reduce-adoc.yml

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+name: Reduce Adoc
+on:
+  push:
+    paths:
+      - '**/*-source.adoc'
+    branches: ['**']
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  reduce:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.2'
+
+      - name: Install asciidoctor-reducer
+        run: gem install --no-document asciidoctor-reducer
+
+      - name: Reduce all *-source.adoc files
+        shell: bash
+        run: |
+          set -euo pipefail
+          mapfile -d '' -t sources < <(find . -type f -name '*-source.adoc' -print0)
+          for src in "${sources[@]}"; do
+            out="${src%-source.adoc}.adoc"
+            mkdir -p "$(dirname "$out")"
+            echo "Reducing $src -> $out"
+            asciidoctor-reducer --preserve-conditionals -o "$out" "$src"
+          done
+
+      - name: Commit reduced files
+        uses: EndBug/add-and-commit@v9