use java vendor in github actions

Author: Alexander Furer

.github/workflows/gradle.yml

@@ -20,7 +20,8 @@ jobs:
     - name: Set up JDK
       uses: actions/setup-java@v2
       with:
-        java-version: 11
+        distribution: 'zulu'
+        java-version: "11"
     - name: Grant execute permission for gradlew
       run: chmod +x gradlew
     - name: Build with Gradle