add concurrency to workflow

Signed-off-by: Henrique Graca <[email protected]>

Author: hjgraca

.github/workflows/e2e-tests.yml

@@ -15,6 +15,9 @@ on:
   push:
     branches:
       - develop
+      
+concurrency:
+  group: e2e
 
 permissions:
   id-token: write