fix fonts installation

.github/workflows/ci.yml

@@ -15,6 +15,16 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          repository: mainmatter/core-sans-a-fonts
+          ssh-key: ${{ secrets.SSH_PRIVATE_KEY }}
+          path: core-sans-a-fonts
+      - name: Install Fonts
+        run: \
+          cp -r core-sans-a-fonts/* /usr/local/share/fonts/core-sans-a
+          fc-cache -f -v
       - uses: actions-rust-lang/setup-rust-toolchain@v1
       - name: Install exercise plugin
         run: cargo install --path helpers/mdbook-exercise-linker
@@ -30,11 +40,8 @@ jobs:
           curl -LsSf https://github.com/jgm/pandoc/releases/download/${PANDOC_VERSION}/pandoc-${PANDOC_VERSION}-linux-amd64.tar.gz | tar zxf -
           echo "$PWD/pandoc-${PANDOC_VERSION}/bin" >> $GITHUB_PATH
         shell: bash
-      - name: Install Fonts
-        run: \
-          git clone [email protected]:mainmatter/core-sans-a-fonts.git tmp/fonts
-          cp -r tmp/fonts/* /usr/local/share/fonts
-          fc-cache -f -v
+
+
       - name: Setup TeX Live
         uses: teatimeguest/setup-texlive-action@v3
         with: