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.github/workflows/ci.yml

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+name: "CI"
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch:
+  schedule:
+    # First day of a month
+    - cron: '0 0 1 * *'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Get Core Sans
+        uses: actions/checkout@v4
+        if: "!github.event.pull_request.head.repo.fork"
+        with:
+          fetch-depth: 0
+          repository: mainmatter/core-sans-a-fonts
+          ssh-key: ${{ secrets.SSH_PRIVATE_KEY }}
+          path: core-sans-a-fonts
+      - name: Install Core Sans Font
+        if: "!github.event.pull_request.head.repo.fork"
+        run: |
+          sudo cp -r core-sans-a-fonts/* /usr/local/share/fonts/
+          sudo fc-cache -f -v
+          fc-list | grep "Core Sans"
+      - name: Use Fallback font for fork PRs
+        if: "github.event.pull_request.head.repo.fork"
+        run: |
+          sed -i 's/"BoldFont=CoreSansA65.ttf",//g' book/book.toml
+          sed -i 's/"ItalicFont=CoreSansA45It.ttf",//g' book/book.toml
+          sed -i 's/"BoldItalicFont=CoreSansA65It.ttf",//g' book/book.toml
+          sed -i 's/CoreSansA45.ttf/Open Sans:style=Regular/g' book/book.toml
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+      - name: Install exercise plugin
+        run: cargo install --path helpers/mdbook-exercise-linker
+      - name: Install link shortener plugin
+        run: cargo install --path helpers/mdbook-link-shortener
+      - name: Install mdbook-pandoc, calibre, pdftk and related dependencies
+        run: |
+          cargo install mdbook-pandoc --locked --version 0.7.1
+          sudo apt-get update
+          sudo apt-get install -y fonts-noto fonts-open-sans calibre pdftk
+          sudo fc-cache -f -v
+          export PANDOC_VERSION=3.3
+          curl -LsSf https://github.com/jgm/pandoc/releases/download/${PANDOC_VERSION}/pandoc-${PANDOC_VERSION}-linux-amd64.tar.gz | tar zxf -
+          echo "$PWD/pandoc-${PANDOC_VERSION}/bin" >> $GITHUB_PATH
+        shell: bash
+      - name: Setup TeX Live
+        uses: teatimeguest/setup-texlive-action@v3
+        with:
+          packages:
+            scheme-basic
+            luatex
+            lualatex-math
+            luacolor
+            luatexbase
+            luaotfload
+            framed
+            unicode-math
+            xcolor
+            geometry
+            longtable
+            booktabs
+            array
+            lua-ul
+            etoolbox
+            fancyvrb
+            footnote
+            selnolig
+            natbib
+            csquotes
+            bookmark
+            xurl
+            amsmath
+            setspace
+            iftex
+      - name: Check `tlmgr` version
+        run: tlmgr --version
+      - uses: taiki-e/install-action@v2
+        with:
+          tool: mdbook
+      - name: Build book
+        env:
+          LINK_SHORTENER_VERIFY: "true"
+        run: |
+          cd book
+          mdbook build
+      - name: Add cover and back to downloadable PDF
+        run: |
+          pdftk book/assets/cover.pdf book/book/pandoc/pdf/100-exercises-to-learn-rust.pdf book/assets/back.pdf cat output book/book/pandoc/pdf/100-exercises-to-learn-rust-with-cover.pdf
+          mv book/book/pandoc/pdf/100-exercises-to-learn-rust-with-cover.pdf book/book/pandoc/pdf/100-exercises-to-learn-rust.pdf
+      - name: Convert HTML to ePUB
+        run: |
+          cd book/book/pandoc/html
+          sed -i 's|<code>\\newpage</code>{=latex}||g' 100-exercises-to-learn-rust.html
+          ebook-convert 100-exercises-to-learn-rust.html 100-exercises-to-learn-rust.epub \
+            --embed-all-fonts \
+            --subset-embedded-fonts
+      - name: Link Checker
+        uses: lycheeverse/lychee-action@v1
+        with:
+          fail: true
+          args: |
+            --exclude-loopback 
+            --require-https 
+            --no-progress 
+            book/book/html/
+      # Upload the HTML book as an artifact
+      - uses: actions/upload-artifact@v4
+        with:
+          name: book
+          # When you support multiple formats, the output directory changes
+          # to include the format in its path.
+          path: book/book/html
+      - uses: actions/upload-artifact@v4
+        with:
+          name: online-pdf
+          path: book/book/pandoc/pdf/100-exercises-to-learn-rust.pdf
+      - uses: actions/upload-artifact@v4
+        with:
+          name: paperback
+          path: book/book/pandoc/paperback/100-exercises-to-learn-rust.pdf
+      - uses: actions/upload-artifact@v4
+        with:
+          name: ePUB
+          path: book/book/pandoc/html/100-exercises-to-learn-rust.epub
+
+  is_fresh:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - run: sudo apt-get update && sudo apt-get install -y jq
+      - run: |
+          ./helpers/json2redirects.sh book/link2alias.json > site/_redirects
+      # Verify nothing has changed, meaning that the redirect file is up-to-date
+      - run: |
+          git diff --exit-code site/_redirects
+
+  gravity:
+    runs-on: ubuntu-latest
+    needs: [build]
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          path: book
+          pattern: online-pdf
+      - uses: pnpm/action-setup@v4
+        with:
+          version: 9
+      - run: ls -las ./book
+      - name: Run Gravity
+        run: pnpm dlx @gravityci/cli "./book/**/*"
+        env:
+          GRAVITY_TOKEN: ${{ secrets.GRAVITY_TOKEN }}
+
+  formatter:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dprint/check@v2.2