Restore Xvfb for renderer launch

.gitea/workflows/build-readme.yml

@@ -50,7 +50,7 @@ jobs:
       - name: Install Vulkan runtime
         run: |
           sudo apt-get update
-          sudo apt-get install -y libvulkan1
+          sudo apt-get install -y libvulkan1 xvfb
 
       - name: Build readme
         run: python build/scripts/build_readme.py --pack-root resourcepack --output-dir build

build/client-renderer/build.gradle

@@ -53,8 +53,4 @@ loom {
             programArgs '--username', 'RenderBot'
         }
     }
-}
-
-tasks.named('runClient') {
-    useXvfb.set(false)
 }