[CI] add SonarCube (#2758)

[CI] add SonarCube

.github/workflows/sonarcube.yaml

@@ -0,0 +1,13 @@
+name: SonarCube
+
+on: push
+
+jobs:
+    sonnar_cloud:
+        runs-on: ubuntu-latest
+        steps:
+            -   uses: actions/checkout@master
+            -   uses: sonarsource/sonarcloud-github-action@master
+                env:
+                    GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+                    SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}

sonar-project.properties

@@ -0,0 +1,10 @@
+# see https://sonarcloud.io/documentation/project-administration/narrowing-the-focus/
+sonar.organization=rectorphp
+sonar.projectKey=rectorphp_rector
+
+# relative paths to source
+sonar.sources=compiler,packages,src
+sonar.tests=tests
+
+# see https://docs.sonarqube.org/latest/project-administration/narrowing-the-focus/#NarrowingtheFocus-patterns
+sonar.exclusions=**/**/*.php.inc