[ci][microcheck/7] add go label on auto-merge

Signed-off-by: can <[email protected]>

.github/workflows/on_auto_merge.yaml

@@ -0,0 +1,19 @@
+name: Auto merge enabled
+on:
+  pull_request_target:
+    types:
+      - auto_merge_enabled
+jobs:
+  add-label:
+    runs-on: ubuntu-latest
+      steps:
+        - name: Add go label
+          uses: actions/github-script@v5
+          with:
+            script: |
+              github.rest.issues.addLabels({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: context.issue.number,
+                labels: ['go']
+              })