CI: install openjdk 17

Author: TheMeier

.github/workflows/tests.yaml

@@ -55,7 +55,10 @@ jobs:
     steps:
       - name: Checkout current PR
         uses: actions/checkout@v6
-
+      - name: Install openjdk jdk 17
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y openjdk-17-jdk
       - name: Install ruby version ${{ matrix.cfg.ruby }}
         uses: ruby/setup-ruby@v1
         with: