Merge pull request #755 from IETS3/feature/PR_into_next_version_2021.3

Activate automatic merging of PRs into the next maintenance branch

Author: sergej-koscejev

.github/workflows/PR-into-next-version.yml

@@ -0,0 +1,12 @@
+name: PR to merge into the next version
+
+on:
+  push:
+    branches:
+      - 'maintenance/mps*'
+
+jobs:
+  create-pr:
+    uses: specificlanguages/cascading-merge/.github/workflows/workflow.yml@v1
+    with:
+      exclude_branch_prefix: maintenance/mps3