Use Ubuntu JDK

Author: daniel-raffler

.github/workflows/ci.yml

@@ -24,11 +24,7 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: Set up JDK ${{ matrix.java-version }}
-        uses: actions/setup-java@v5
-        with:
-          java-version: ${{ matrix.java-version }}
-          distribution: 'temurin'
-          architecture: ${{ matrix.arch }}
+        run: sudo apt install openjdk-21-jdk ant
 
       - name: Shared Ivy Cache
         uses: actions/cache@v5