Adjust GH workflow for Ubuntu

Author: utelle

.github/workflows/ci4wxpdfdoc.yml

@@ -23,7 +23,7 @@ jobs:
         sudo add-apt-repository ppa:kicad/kicad-7.0-releases
         sudo apt update
         sudo apt-get install -y libwxgtk3.2-dev
-        sudo apt-get install -y libzint-dev libwoff-dev
+        sudo apt-get install -y libzint-dev libwoff-dev libfontconfig-dev
       if: matrix.os == 'ubuntu-latest'
     - name: Install dependencies (macOS)
       run: |