[SPARK-32245][INFRA][FOLLOWUP] Reenable Github Actions on commit

### What changes were proposed in this pull request?

This PR reenables GitHub Action on every commit as a next step.

### Why are the changes needed?

We carefully enabled GitHub Action on every PRs, and it looks good so far.

As we saw at #29072, GitHub Action is already triggered at every commits on every PRs. Enabling GitHub Action on `master` branch commit doesn't make a big difference. And, we need to start to test at every commit as a next step.

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

Manual.

Closes #29076 from dongjoon-hyun/reenable_gha_commit.

Authored-by: Dongjoon Hyun <dongjoon@apache.org>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>

.github/workflows/master.yml

@@ -1,6 +1,9 @@
 name: master
 
 on:
+  push:
+    branches:
+    - master
   pull_request:
     branches:
     - master