[chore](autopick)When the PR is merged, adding a label afterward shou…

…ld also trigger the workflow.

## Important Note:
There’s a potential issue here: if the label was added before the merge and later removed, the workflow may still be triggered again. Please avoid performing these operations repeatedly, as CI resources are valuable.

.github/workflows/auto-cherry-pick.yml

@@ -21,6 +21,7 @@ on:
   pull_request_target:
     types:
       - closed
+      - labeled
     branches:
       - master
 permissions:
@@ -30,7 +31,7 @@ permissions:
 jobs:
   auto_cherry_pick:
     runs-on: ubuntu-latest
-    if: ${{ (contains(github.event.pull_request.labels.*.name, 'dev/3.0.x') || contains(github.event.pull_request.labels.*.name, 'dev/2.1.x')) && github.event.pull_request.merged == true }}
+    if: ${{(contains(github.event.pull_request.labels.*.name, 'dev/3.0.x') || contains(github.event.pull_request.labels.*.name, 'dev/2.1.x') ||github.event.label.name == 'dev/3.0.x' || github.event.label.name == 'dev/2.1.x') && github.event.pull_request.merged == true }}
     steps:
       - name: Checkout repository
         uses: actions/checkout@v3
@@ -54,15 +55,15 @@ jobs:
               echo "SHA matches: $calculated_sha"
             fi
       - name: Auto cherry-pick to branch-3.0
-        if: ${{ contains(github.event.pull_request.labels.*.name, 'dev/3.0.x') }}
+        if: ${{ ((github.event.action == 'labeled' && github.event.label.name == 'dev/3.0.x'))|| ((github.event_name == 'pull_request_target' && github.event.action == 'closed') && contains(github.event.pull_request.labels.*.name, 'dev/3.0.x')) }}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           REPO_NAME: ${{ github.repository }}
           CONFLICT_LABEL: cherry-pick-conflict-in-3.0
         run: |
           python tools/auto-pick-script.py ${{ github.event.pull_request.number }} branch-3.0  
       - name: Auto cherry-pick to branch-2.1
-        if: ${{ contains(github.event.pull_request.labels.*.name, 'dev/2.1.x') }}
+        if: ${{ ((github.event.action == 'labeled' && github.event.label.name == 'dev/2.1.x'))|| ((github.event_name == 'pull_request_target' && github.event.action == 'closed') && contains(github.event.pull_request.labels.*.name, 'dev/2.1.x')) }}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           REPO_NAME: ${{ github.repository }}