Add automatic merge action

.github/workflows/automerge.yaml

@@ -0,0 +1,28 @@
+name: 'Automatically merge master -> dev'
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    name: Automatically merge master to dev
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        name: Git checkout
+        with:
+          fetch-depth: 0
+      - name: Merge master -> dev
+        run: |
+          git config user.name "GitHub Actions"
+          git config user.email "PiotrMachowski@users.noreply.github.com"
+          if (git checkout dev)
+          then
+          git merge --ff-only master || git merge --no-commit master
+          git commit -m "Automatically merge master -> dev" || echo "No commit needed"
+          git push origin dev
+          else
+          echo "No dev branch"
+          fi