fix linux

Author: BobLd

.github/workflows/unit-tests.yml

@@ -56,6 +56,12 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Install SkiaSharp Linux dependencies
+        if: matrix.os == 'linux'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libfontconfig1
+
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with: