use xvfb-action otherwise the gui test won't work

.github/workflows/build.yml

@@ -280,10 +280,10 @@ jobs:
       - name: Test
         # TODO: Re-Enable this when https://github.com/actions/runner/issues/1206 gets resolved
         if: matrix.env.ninja_platform != 'win' && matrix.env.ninja_platform != 'mac'
-        continue-on-error: true
-        run: |
-          cd build/release
-          ninja check
+        uses: GabrielBB/xvfb-action@v1
+        with:
+          working-directory: build/release
+          run: ninja check
 
   publish:
     # https://github.com/marvinpinto/actions/issues/177