protecting pushes to dev

.github/workflows/protect_releases.yml

@@ -0,0 +1,17 @@
+name: Restrict PR source
+
+on:
+  pull_request:
+    branches:
+      - dev
+
+jobs:
+  check-source-branch:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Fail if PR is not from main
+        run: |
+          if [[ "${{ github.head_ref }}" != "main" ]]; then
+            echo "Only PRs from main are allowed into dev"
+            exit 1
+          fi