Reorganising build.gradle for CUDA 12

Signed-off-by: brian <brian@brutex.de>

.gitea/workflows/demo.yaml

@@ -4,7 +4,7 @@ on: [push]
 
 jobs:
   Explore-Gitea-Actions:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04:docker://nvidia/cuda:12.2.0-devel-ubuntu20.04
     steps:
       - run: echo "The job was automatically triggered by a ${{ gitea.event_name }} event."
       - run: echo "This job is now running on a ${{ runner.os }} server hosted by Gitea!"
@@ -17,6 +17,12 @@ jobs:
         run: |
           ls ${{ gitea.workspace }}
 
+      - name: Setup Java
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'temurin' # See 'Supported distributions' for available options
+          java-version: '11'
+
       - name: Setup Gradle
         uses: gradle/gradle-build-action@v2