chore: automate merging develop to next minor branch

.github/workflows/merge-develop-to-minor-branch.yml

@@ -0,0 +1,24 @@
+name: Merge develop to next minor branch
+
+on:
+  push:
+    branches:
+      - develop
+
+jobs:
+  merge-branch:
+    name: Merge develop branch
+    if: github.repository_owner == 'codeigniter4'
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Merge branch
+        uses: everlytic/[email protected]
+        with:
+          github_token: ${{ github.token }}
+          source_ref: ${{ github.ref }}
+          target_branch: '4.6' # bump when minor version is bumped
+          commit_message_template: 'Merge branch ''{source_ref}'' into {target_branch}'