Update backport PR conditions (#1826)

* update run action conditions

* noop change for testing (#1822)

* remove create app token step

* update to only run when labeling a merged pr

* noop to test backport pr (#1824)

* testing (#1825)

Author: swang392

.github/workflows/backport-pr.yml

@@ -1,7 +1,7 @@
 name: Backport PR
 on:
   pull_request:
-    types: [ labeled, closed ]
+    types: [ labeled ]
 
 permissions: {}
 
@@ -10,26 +10,18 @@ jobs:
     name: Backport PR
     runs-on: ubuntu-latest
     if: >
-      github.event.pull_request.merged
-      && (
-        ( github.event.action == 'closed' && contains(github.event.label.name, 'backport') )
-        || 
-        ( github.event.action == 'labeled' && contains(github.event.label.name, 'backport') )
-      )
+        github.event.action == 'labeled'
+        && github.event.pull_request.merged_at != null
+        && contains(github.event.label.name, 'backport/')
     permissions:
       contents: write
       pull-requests: write
     steps:
-      - uses: actions/create-github-app-token@21cfef2b496dd8ef5b904c159339626a10ad380e # v1.11.6
-        id: app-token
-        with:
-          app-id: ${{ vars.DD_GITHUB_TOKEN_GENERATOR_APP_ID }}
-          private-key: ${{ secrets.DD_GITHUB_TOKEN_GENERATOR_PRIVATE_KEY }}
       - uses: tibdex/backport@9565281eda0731b1d20c4025c43339fb0a23812e # v2.0.4
         with:
           label_pattern: "^backport/(?<base>([^ ]+))$" 
           labels_template: "<%= JSON.stringify([...labels, 'backport', 'bot']) %>"
-          github_token: ${{ steps.app-token.outputs.token }}
+          github_token: ${{ secrets.GITHUB_TOKEN }}
           title_template: "[ Backport <%- base %> ] <%- title %>"
           body_template: |
             Backport <%- mergeCommitSha %> from #<%- number %>.