ci: backport action on v12 (#27009)

[skip ci]

.github/workflows/backport.yml

@@ -0,0 +1,26 @@
+name: Backport
+on:
+  pull_request_target:
+    types:
+      - closed
+      - labeled
+
+jobs:
+  main:
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    steps:
+      - name: Checkout Actions
+        uses: actions/checkout@v2
+        with:
+          repository: "frappe/backport"
+          path: ./actions
+          ref: develop
+      - name: Install Actions
+        run: npm install --production --prefix ./actions
+      - name: Run backport
+        uses: ./actions/backport
+        with:
+          token: ${{secrets.BACKPORT_BOT_TOKEN}}
+          labelsToAdd: "backport"
+          title: "{{originalTitle}}"