From 137d161480252c58c10e9aa426989bad5b36e450 Mon Sep 17 00:00:00 2001
From: yeasy <yangbaohua@gmail.com>
Date: Sat, 28 Mar 2026 20:42:25 -0700
Subject: [PATCH] Add preview PDF

---
 .github/workflows/preview-pdf.yml | 74 +++++++++++++++++++++++++++++++
 README.md                         |  2 +
 2 files changed, 76 insertions(+)
 create mode 100644 .github/workflows/preview-pdf.yml

diff --git a/.github/workflows/preview-pdf.yml b/.github/workflows/preview-pdf.yml
new file mode 100644
index 0000000..a4c95b6
--- /dev/null
+++ b/.github/workflows/preview-pdf.yml
@@ -0,0 +1,74 @@
+name: Update Preview PDF
+
+on:
+  push:
+    branches:
+      - master
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+concurrency:
+  group: preview-pdf
+  cancel-in-progress: true
+
+jobs:
+  update-preview-pdf:
+    name: Update preview release
+    runs-on: ubuntu-latest
+    env:
+      GH_TOKEN: ${{ github.token }}
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Install Chromium and CJK fonts
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y chromium-browser fonts-noto-cjk fonts-noto-cjk-extra
+
+      - name: Install mdpress (latest)
+        run: |
+          LATEST_TAG=$(curl -fsSL https://api.github.com/repos/yeasy/mdpress/releases/latest | jq -r .tag_name)
+          VERSION="${LATEST_TAG#v}"
+          echo "Installing mdpress $VERSION"
+          curl -fsSL "https://github.com/yeasy/mdPress/releases/download/$LATEST_TAG/mdpress_${VERSION}_linux_amd64.tar.gz" -o /tmp/mdpress.tar.gz
+          tar xzf /tmp/mdpress.tar.gz -C /tmp mdpress
+          sudo mv /tmp/mdpress /usr/local/bin/
+          mdpress --version
+
+      - name: Build latest preview PDF
+        run: |
+          mkdir -p dist
+          mdpress build --format pdf --output dist/latest.pdf
+
+      - name: Write release notes
+        run: |
+          cat > dist/release-notes.md <<EOF
+          Auto-updated preview PDF from \`${GITHUB_SHA::7}\`.
+
+          - Branch: \`${GITHUB_REF_NAME}\`
+          - Commit: https://github.com/${GITHUB_REPOSITORY}/commit/${GITHUB_SHA}
+          - Run: https://github.com/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID}
+          EOF
+
+      - name: Create preview release
+        run: |
+          gh release view preview-pdf >/dev/null 2>&1 || \
+            gh release create preview-pdf \
+              --title "Latest Preview PDF" \
+              --notes-file dist/release-notes.md \
+              --prerelease \
+              --latest=false \
+              --target "$GITHUB_SHA"
+
+      - name: Update preview release metadata
+        run: |
+          gh release edit preview-pdf \
+            --title "Latest Preview PDF" \
+            --notes-file dist/release-notes.md \
+            --prerelease \
+            --target "$GITHUB_SHA"
+
+      - name: Upload preview PDF
+        run: gh release upload preview-pdf dist/latest.pdf --clobber
diff --git a/README.md b/README.md
index 4aab925..dc5dfb6 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,8 @@
 
 本书提供 PDF 版本供离线阅读，可前往 [GitHub Releases](https://github.com/yeasy/docker_practice/releases/latest) 页面下载最新版本。
 
+如需获取默认分支自动更新的预览版，可直接下载 [latest preview PDF](https://github.com/yeasy/docker_practice/releases/download/preview-pdf/latest.pdf)。该文件会随主线更新覆盖，不代表正式发布版本。
+
 [Docker](https://www.docker.com) 是个划时代的开源项目，它彻底释放了计算虚拟化的威力，极大提高了应用的维护效率，降低了云计算应用开发的成本！使用 Docker，可以让应用的部署、测试和分发都变得前所未有的高效和轻松！
 
 无论是应用开发者、运维人员、还是其他信息技术从业人员，都有必要认识和掌握 Docker，节约有限的生命。