ci add workflow to check code formatting

.github/workflows/check_style.yml

@@ -0,0 +1,24 @@
+name: Verify code formatting
+on:
+  push:
+  pull_request:
+
+jobs:
+  verify-formatting:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          persist-credentials: false
+          fetch-depth: 0
+      - name: Install astyle
+        run: |
+          sudo add-apt-repository -y "deb http://archive.ubuntu.com/ubuntu `lsb_release -sc` main universe restricted multiverse"
+          sudo apt-get update -y -qq
+          sudo apt-get install astyle
+      - name: Format code
+        run: ./code-format.sh
+        working-directory: scripts
+      - name: Check that repository is clean
+        run: git diff --exit-code || (echo "Please apply the preceding diff to your code or run scripts/code-format.sh"; false)