feat: add JDK caching to workflow for improved build performance

.gitea/workflows/action.yaml

@@ -10,12 +10,19 @@ jobs:
       - name: Checkout Repository
         uses: actions/checkout@v4
 
+      - name: Cache JDK
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.sdkman/candidates/java
+          key: jdk-${{ runner.os }}-oracle-21
+          restore-keys: jdk-${{ runner.os }}-
+
       - name: Set up JDK
         uses: actions/setup-java@v4
         with:
           distribution: 'oracle'
           java-version: '21'
-          cache: 'gradle'
 
       #- name: Install Gradle
       #  run: |