Merge pull request #3083 from stof/ci

Enable the static analysis CI workflow for the 3.x branch

Author: stof

.github/workflows/static-analysis.yaml

@@ -3,7 +3,7 @@ name: Code style and composer validate
 on:
     pull_request:
     push:
-        branches: [ master, 2.x ]
+        branches: [ master, 2.x, 3.x ]
 
 jobs:
     composer-validate: