[ci] install fonttools in linux-ci bot

.github/workflows/linux-ci.yml

@@ -14,8 +14,8 @@ jobs:
     - uses: actions/checkout@v2
     - name: install dependencies
       run: sudo apt-get install pkg-config gcc ragel gcovr gtk-doc-tools libfreetype6-dev libglib2.0-dev libcairo2-dev libicu-dev libgraphite2-dev python3 python3-setuptools ninja-build # libgirepository1.0-dev
-    - name: install meson
-      run: sudo pip3 install meson
+    - name: install meson and fonttools
+      run: sudo pip3 install meson fonttools
     - name: run
       run: meson build -Db_coverage=true -Dglib=enabled -Dcairo=enabled -Dicu=enabled -Dgraphite=enabled -Dfreetype=enabled
     - name: ci