[workflows] Fix GitHub CI error: No event triggers defined in 'on'.

Author: neboat

.github/workflows/libclang-abi-tests.yml

@@ -2,13 +2,13 @@ name: libclang ABI Tests
 
 # TODO: Enable this test based on OpenCilk Clang changes.
 
-# on:
-#   push:
-#     branches:
-#       - 'release/**'
-#     paths:
-#       - 'clang/**'
-#       - '.github/workflows/libclang-abi-tests.yml'
+on:
+  push:
+    branches:
+      - 'nobranch/**'
+    paths:
+      - 'clang/**'
+      - '.github/workflows/libclang-abi-tests.yml'
 #   pull_request:
 #     paths:
 #       - 'clang/**'