Use sdkman GH action for Java in PRs.

Author: marc0der

.github/workflows/pr.yml

@@ -8,10 +8,17 @@ jobs:
         uses: actions/checkout@v2
         with:
             ref: ${{ github.event.pull_request.head.sha }}
-      - name: Set up JDK 11.0.11
-        uses: actions/setup-java@v1
+
+      - uses: sdkman/sdkman-action@master
+        id: sdkman
         with:
-          java-version: 11.0.11
+          candidate: java
+          version: 11.0.12-sem
+      - uses: actions/setup-java@v1
+        id: setup-java
+        with:
+          java-version: 11.0.12
+          jdkFile: ${{ steps.sdkman.outputs.file }}            
       - name: Run with Gradle
         run: ./gradlew clean test --info
       - uses: kentaro-m/[email protected]