Run label check workflow only on label events and open pr event

Author: kyu08

.github/workflows/check-required-label.yml

@@ -0,0 +1,15 @@
+name: Check Required Labels
+
+on:
+  pull_request:
+    types: [opened, labeled, unlabeled]
+
+jobs:
+  check-required-label:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: mheap/github-action-required-labels@v5
+        with:
+          mode: exactly
+          count: 1
+          labels: "ignore-for-release, feature, enhancement, bug, maintenance, docs, i18n, performance"

.github/workflows/ci.yml

@@ -175,15 +175,6 @@ jobs:
       - name: errors
         run: golangci-lint run
         if: ${{ failure() }}
-  check-required-label:
-    runs-on: ubuntu-latest
-    if: github.ref != 'refs/heads/master'
-    steps:
-      - uses: mheap/github-action-required-labels@v5
-        with:
-          mode: exactly
-          count: 1
-          labels: "ignore-for-release, feature, enhancement, bug, maintenance, docs, i18n, performance"
   upload-coverage:
     # List all jobs that produce coverage files
     needs: [unit-tests, integration-tests]