Backport merged Pull Request

.github/PULL_REQUEST_TEMPLATE.md

@@ -2,7 +2,6 @@
 <!--- Please address the following points before setting your PR "ready for review".
 --->
 - General:
-    - [ ]  **base branch** must be `main` for new features, latest release branch (e.g. `release/1.3.x`) for bug fixes
     - [ ]  **title** of the PR is suitable to appear in the [Release Notes](https://github.com/helmholtz-analytics/heat/releases/latest)
 - Implementation:
     - [ ] unit tests: all split configurations tested

.github/issue-branch.yml

@@ -5,7 +5,6 @@ defaultBranch: 'main'
 
 branches:
   - label: bug
-    name: release/1.3.x
     prefix: bugs/
   - label: enhancement
     prefix: features/

.github/workflows/backport.yml

@@ -0,0 +1,19 @@
+name: Backport merged pull request
+on:
+  pull_request_target:
+    types: [closed]
+permissions:
+  contents: write # so it can comment
+  pull-requests: write # so it can create pull requests
+jobs:
+  backport:
+    name: Backport pull request
+    runs-on: ubuntu-latest
+    # Don't run on closed unmerged pull requests
+    if: github.event.pull_request.merged
+    steps:
+      - uses: actions/checkout@v4
+      - name: Create backport pull requests
+        uses: korthout/backport-action@v2
+        with:
+          merge_commits: 'skip'