Add GHA rules

Author: tomasz-tylenda-sonarsource

renovate.json5

@@ -11,4 +11,15 @@
     "its/plugin/projects/**",
     "java-checks-test-sources/**",
   ],
+  packageRules: [
+    {
+      description: "SonarSource GitHub actions do not need version pinning (neither fixed SHA, nor v3 -> v3.1.2)",
+      matchManagers: [ "github-actions" ],
+      "matchPackagePatterns": [
+        "^SonarSource/"
+      ],
+      matchUpdateTypes: [ "pin", "rollback"],
+      enabled: false
+    },
+  ],
 }