ci: Install harfbuzz

Author: wezm

.github/workflows/ci.yml

@@ -27,6 +27,12 @@ jobs:
         with:
           toolchain: ${{ matrix.rust }}
           components: rustfmt
+
+      - name: Install dependencies
+        run: |
+          sudo apt update
+          sudo apt install libharfbuzz-dev
+
       - run: cargo fmt -- --check
       - run: cargo test
       - run: cargo test --features harfbuzz