Render book as PDF in publish.yml workflow (#1572)

Renders the book as a PDF and includes it in the published HTML bundle
as `comprehensive-rust.pdf`.

Closes #1543

.github/workflows/build.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/bash
+#!/usr/bin/env bash
 set -Eeuo pipefail
 
 # Usage: build.sh <book-lang> <dest-dir>
@@ -29,9 +29,13 @@ else
     export MDBOOK_BOOK__LANGUAGE=$book_lang
     export MDBOOK_OUTPUT__HTML__SITE_URL=/comprehensive-rust/$book_lang/
     export MDBOOK_OUTPUT__HTML__REDIRECT='{}'
+
+    # Include language-specific Pandoc configuration
+    [ -f "pandoc/$book_lang.yaml" ] && export MDBOOK_OUTPUT__PANDOC__PROFILE__PDF__DEFAULTS="pandoc/$book_lang.yaml"
 fi
 
 mdbook build -d "$dest_dir"
+[ -f "$dest_dir/pandoc/pdf/comprehensive-rust.pdf" ] && mv "$dest_dir/pandoc/pdf/comprehensive-rust.pdf" "$dest_dir/html/"
 (cd "$dest_dir/exerciser" && zip --recurse-paths ../html/comprehensive-rust-exercises.zip comprehensive-rust-exercises/)
 
 echo "::endgroup::"

.github/workflows/publish.yml

@@ -39,6 +39,13 @@ jobs:
       - name: Install mdbook
         uses: ./.github/workflows/install-mdbook
 
+      - name: Install mdbook-pandoc and related dependencies
+        run: |
+          cargo install mdbook-pandoc --locked --version 0.4.0
+          sudo apt-get install -y texlive texlive-luatex texlive-lang-cjk librsvg2-bin fonts-noto
+          curl -LsSf https://github.com/jgm/pandoc/releases/download/3.1.11/pandoc-3.1.11-linux-amd64.tar.gz | tar zxf -
+          echo "$PWD/pandoc-3.1.11/bin" >> $GITHUB_PATH
+
       - name: Build course in English
         run: .github/workflows/build.sh en book