Introduce backport GH action

.github/workflows/backport.yml

@@ -0,0 +1,35 @@
+name: Backport
+on:
+  pull_request:
+    types: [closed, labeled]
+  permissions:
+    contents: write # so it can comment
+    pull-requests: write # so it can create pull requests
+    actions: write
+jobs:
+  backport:
+    name: Backport
+    runs-on: ubuntu-latest
+    if: github.event.pull_request.merged
+    steps:
+      - uses: actions/checkout@v4
+      - name: Create backport pull requests
+        uses: korthout/backport-action@924c8170740fa1e3685f69014971f7f251633f53 # v2.4.1
+        id: backport
+        with:
+          pull_title: '[backport -> ${target_branch}] ${pull_title}'
+          merge_commits: 'skip'
+          copy_labels_pattern: ^(?!backport ).* # copies all labels except those starting with "backport "
+          label_pattern: ^backport (3scale\/[^ ]+)$ # filters for labels starting with "backport " and extracts the branch name
+          pull_description: |-
+            Automated backport to `${target_branch}`, triggered by a label in #${pull_number}.
+
+            ## Original description
+
+            ${pull_description}
+          copy_assignees: true
+          copy_requested_reviewers: true
+          experimental: >
+            {
+              "detect_merge_method": true
+            }