Add gradle plugin (as demanded by the GitHub action)

.github/workflows/tests.yml

@@ -216,8 +216,26 @@ jobs:
         uses: actions/checkout@v2
         with:
           depth: 1
-      - name: SonarCloud Scan
-        uses: sonarsource/sonarcloud-github-action@master
+      - name: Set up JDK
+        uses: actions/setup-java@v1
+        with:
+          java-version: 13.0.2
+      - uses: actions/cache@v1
+        name: Restore gradle cache
+        with:
+          path: ~/.gradle/caches
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
+          restore-keys: |
+            ${{ runner.OS }}-gradle-${{ env.cache-name }}-
+            ${{ runner.OS }}-gradle-
+            ${{ runner.OS }}-
+      - uses: actions/cache@v1
+        name: Restore gradle wrapper
+        with:
+          path: ~/.gradle/wrapper
+          key: ${{ runner.os }}-gradle-${{ hashFiles('gradle/wrapper/gradle-wrapper.properties') }}
+      - name: Run SonarCloud Scan
+        run: ./gradlew build sonarqube
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}

build.gradle

@@ -25,6 +25,9 @@ plugins {
     id 'org.openjfx.javafxplugin' version '0.0.8'
     id 'org.beryx.jlink' version '2.17.2'
 
+    // required for SonarCube usage
+    id "org.sonarqube" version "2.8"
+
     // nicer test outputs during running and completion
     id 'com.adarshr.test-logger' version '2.0.0'
 }

gradle.properties

@@ -0,0 +1 @@
+systemProp.sonar.host.url=https://sonarcloud.io